Prostate cancer
Prostate cancer
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Prostate cancer
Other namesProstate carcinoma
Diagram of prostate tumor pressing on urethra
SpecialtyOncology, urology
SymptomsTypically none. Sometimes trouble urinating, erectile dysfunction, or pain in the back/pelvis.
Usual onsetAge over 40
Risk factorsOlder age, family history, race
Diagnostic methodPSA test followed by tissue biopsy
Differential diagnosisBenign prostatic hyperplasia
TreatmentActive surveillance, prostatectomy, radiation therapy, hormone therapy, chemotherapy
PrognosisFive-year survival rates range from 30 to 99%, depending on stage.[1]

Prostate cancer is the uncontrolled growth of cells in the prostate, a gland in the male reproductive system below the bladder. Abnormal growth of the prostate tissue is usually detected through screening tests, typically blood tests that check for prostate-specific antigen (PSA) levels. Those with high levels of PSA in their blood are at increased risk for developing prostate cancer. Diagnosis requires a biopsy of the prostate. If cancer is present, the pathologist assigns a Gleason score; a higher score represents a more dangerous tumor. Medical imaging is performed to look for cancer that has spread outside the prostate. Based on the Gleason score, PSA levels, and imaging results, a cancer case is assigned a stage 1 to 4. A higher stage signifies a more advanced, more dangerous disease.

Most prostate tumors remain small and cause no health problems. These are managed with active surveillance, monitoring the tumor with regular tests to ensure it has not grown. Tumors more likely to be dangerous can be destroyed with radiation therapy or surgically removed by radical prostatectomy. Those whose cancer spreads beyond the prostate are treated with hormone therapy which reduces levels of the androgens (masculinizing sex hormones) which prostate cells need to survive. Eventually cancer cells can grow resistant to this treatment. This most-advanced stage of the disease, called castration-resistant prostate cancer, is treated with continued hormone therapy alongside the chemotherapy drug docetaxel. Some tumors metastasize (spread) to other areas of the body, particularly the bones and lymph nodes. There, tumors cause severe bone pain, leg weakness or paralysis, and eventually death. Prostate cancer prognosis depends on how far the cancer has spread at diagnosis. Most men diagnosed have low-risk tumors confined to the prostate; 99% of them survive more than 10 years from their diagnoses. Tumors that have metastasized to distant body sites are most dangerous, with five-year survival rates of 30–40%.

The risk of developing prostate cancer increases with age; the average age of diagnosis is 67. Those with a family history of any cancer are more likely to have prostate cancer, particularly those who inherit cancer-associated variants of the BRCA2 gene. Each year 1.2 million cases of prostate cancer are diagnosed, and 350,000 die of the disease,[2] making it the second-leading cause of cancer and cancer death in men. One in eight men are diagnosed with prostate cancer in their lifetime and one in forty die of the disease.[3] Prostate tumors were first described in the mid-19th century, during surgeries on men with urinary obstructions. Initially, prostatectomy was the primary treatment for prostate cancer. By the mid-20th century, radiation treatments and hormone therapies were developed to improve prostate cancer treatment. The invention of hormone therapies for prostate cancer was recognized with the 1966 Nobel Prize to Charles Huggins and the 1977 Prize to Andrzej W. Schally.

Signs and symptoms

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Early prostate cancer usually causes no symptoms. As the cancer advances, it may cause erectile dysfunction, blood in the urine or semen, or trouble urinating – commonly including frequent urination and slow or weak urine stream.[4] More than half of men over age 50 experience some form of urination problem,[5] typically due to issues other than prostate cancer such as benign prostatic hyperplasia (non-cancerous enlargement of the prostate).[4]

Advanced prostate tumors can metastasize to nearby lymph nodes and bones, particularly in the pelvis, hips, spine, ribs, head, and neck.[6] There they can cause fatigue, unexplained weight loss, and back or bone pain that does not improve with rest.[7][8] Metastases can damage the bones around them, and around a quarter of those with metastatic prostate cancer develop a bone fracture.[9] Growing metastases can also compress the spinal cord causing weakness in the legs and feet, or limb paralysis.[10][11]

Screening

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Main article: Prostate cancer screening

Most cases of prostate cancer are diagnosed through screening tests, when tumors are too small to cause any symptoms.[4] This is done through blood tests to measure levels of the protein prostate-specific antigen (PSA), which are elevated in those with enlarged prostates, whether due to prostate cancer or benign prostatic hyperplasia.[12][13] The typical man's blood has around 1 nanogram (ng) of PSA per milliliter (mL) of blood tested.[14] Those with PSA levels below average are very unlikely to develop dangerous prostate cancer over the next 8 to 10 years.[14] Men with PSA levels above 4 ng/mL are at increased risk – around 1 in 4 will develop prostate cancer – and are often referred for a prostate biopsy.[15][16] PSA levels over 10 ng/mL indicate an even higher risk: more than half men in this group develop prostate cancer.[15] Men with high PSA levels are often recommended to repeat the blood test four to six weeks later, as PSA levels can fluctuate unrelated to prostate cancer.[17] Benign prostatic hyperplasia, prostate infection, recent ejaculation, and some urological procedures can increase PSA levels; taking 5α-reductase inhibitors can decrease PSA levels.[15]

Those with elevated PSA may undergo secondary screening blood tests that measure subtypes of PSA and other molecules to better predict the likelihood that a person will develop aggressive prostate cancer. Many measure "free PSA" – the fraction of PSA unbound to other blood proteins, usually around 10% to 30%. Men who have a lower percentage of free PSA are more likely to have prostate cancer.[18] Several common tests more accurately detect prostate cancer cases by also measuring subtypes of free PSA, including the Prostate Health Index (measures a fragment called −2proPSA) and 4K score (measures intact free PSA).[19][20] Other tests measure blood levels of additional prostate-related proteins such as kallikrein-2 (also measured by 4K score), or urine levels of mRNA molecules common to prostate tumors like PCA3 and TMPRSS2 fused to ERG.[21]

Several large studies have found that men screened for prostate cancer have a reduced risk of dying from the disease;[22] however, detection of cancer cases that would not have otherwise impacted health can cause anxiety, and lead to unneeded biopsies and treatments, both of which can cause unwanted complications.[12] Major national health organizations offer differing recommendations, attempting to balance the benefits of early diagnosis with the potential harms of treating people whose tumors are unlikely to impact health.[12] Most medical guidelines recommend that men at high risk of prostate cancer (due to age, family history, ethnicity, or prior evidence of high blood PSA levels) be counseled on the risks and benefits of PSA testing, and be offered access to screening tests.[12] Medical guidelines generally recommend against screening for men over age 70, or with a life expectancy of less than 10 years, as a newly diagnosed prostate cancer is unlikely to impact their natural lifespan.[12][22] Uptake of screening varies by geography – more than 80% of men are screened in the US and Western Europe, 20% of men in Japan, and screening is rare in regions with a low Human Development Index.[22]

Diagnosis

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A gloved finger inserted into a man's rectum presses on the prostate.
Diagram of a digital rectal exam

Men suspected of having prostate cancer may undergo several tests to assess the prostate. One common procedure is the digital rectal examination, in which a doctor inserts a lubricated finger into the rectum to feel the nearby prostate.[23][24] Tumors feel like stiff, irregularly shaped lumps against the rest of the prostate. Hardening of the prostate can also be due to benign prostatic hyperplasia; around 20–25% of those with abnormal findings on their rectal exams have prostate cancer.[25] Several urological societies' guidelines recommend magnetic resonance imaging (MRI) to evaluate the prostate for potential tumors in men with high PSA levels. MRI results can help distinguish those who have potentially dangerous tumors from those who do not.[26]

A definitive diagnosis of prostate cancer requires a biopsy of the prostate. Prostate biopsies are typically taken by a needle passing through the rectum or perineum, guided by transrectal ultrasonography, MRI, or a combination of the two.[27][24] Ten to twelve samples are taken from several regions of the prostate to improve the chances of finding any tumors.[24] Biopsies are sent for a histopathologic diagnosis of prostate cancer, wherein they are examined under a microscope by a pathologist, who determines the type and extent of cancerous cells present. Cancers are first classified based on their appearance under a microscope. More than 95% of prostate cancers are classified as adenocarcinomas (resembling gland tissue), with the rest largely squamous-cell carcinoma (resembling squamous cells, a type of epithelial cell) and transitional cell carcinoma (resembling transitional cells).[28]

Medical images of a man's torso. Arrows indicate tumor metastases, visible as dots in the man's spine and pelvis, in both scans.
CT scan (left) and PSMA scan (right) showing prostate cancer metastases in the bone (red arrows). The dye used for PSMA scans is also absorbed by the kidneys, liver, and spleen (large dark objects at right).

Next, tumor samples are graded based on how much the tumor tissue differs from normal prostate tissue; the more different the tumor appears, the faster the tumor is likely to grow. The Gleason grading system is commonly used, where the pathologist assigns numbers ranging from 3 (most similar to healthy prostate tissue) to 5 (least similar) to different regions of the biopsied tissue. They then calculate a "Gleason score" by adding the two numbers that represent the largest areas of the biopsy sample.[28] The lowest possible Gleason score of 6 represents a biopsy most similar to healthy prostate; the highest Gleason score of 10 represents the most severely cancerous.[note 1] Gleason scores are commonly grouped into "Gleason grade groups", which predict disease prognosis: a Gleason score of 6 is Gleason grade group 1 (best prognosis). A score of 7 (with Gleason scores 4 + 3, or Gleason scores 3 + 4, with the most prominent listed first) can be grade group 2 or 3; it is grade group 2 if the less severe Gleason score (3) covered more area; grade group 3 if the more severe Gleason score (4) covered more area. A score of 8 is grade group 4. A score of 9 or 10 is grade group 5 (worst prognosis).[28]

The extent of cancer spread is assessed by MRI or PSMA scan – a positron emission tomography (PET) imaging technique where a radioactive label that binds the prostate protein prostate-specific membrane antigen is used to detect metastases distant from the prostate.[30][24] CT scans may also be used, but are less able to detect spread outside the prostate than MRI. Bone scintigraphy is used to test for spread of cancer to bones.[30]

Staging

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Main article: Prostate cancer staging
Diagram of a prostate showing a small (T1), medium (T2), and large (T3) tumor
Diagram showing T1 to T3 stages of prostate cancer

After diagnosis, the tumor is staged to determine the extent of its growth and spread. Prostate cancer is typically staged using the American Joint Committee on Cancer's (AJCC) three-component TNM system, with scores assigned for the extent of the tumor (T), spread to any lymph nodes (N), and the presence of metastases (M).[31] Scores of T1 and T2 represent tumors that remain within the prostate: T1 is for tumors not detectable by imaging or digital rectal exam; T2 is for tumors detectable by imaging or rectal exam, but still confined within the prostate.[32] T3 is for tumors that grow beyond the prostate – T3a for tumors with any extension outside the prostate; T3b for tumors that invade the adjacent seminal vesicles. T4 is for tumors that have grown into organs beyond the seminal vesicles.[32] The N and M scores are binary (yes or no). N1 represents any spread to the nearby lymph nodes. M1 represents any metastases to other body sites.[32]

The AJCC then combines the TNM scores, Gleason grade group, and results of the PSA blood test to categorize cancer cases into one of four stages, and their subdivisions. Cancer cases with localized tumors (T1 or T2), no spread (N0 and M0), Gleason grade group 1, and PSA less than 10 ng/mL are designated stage I. Those with localized tumors and PSA between 10 and 20 ng/mL are designated stage II – subdivided into IIA for Gleason grade group 1, IIB for grade group 2, and IIC for grade group 3 or 4. Stage III is the designation for any of three higher risk factors: IIIA is for a PSA level about 20 ng/mL; IIIB is for T3 or T4 tumors; IIIC is for a Gleason grade group of 5. Stage IV is for cancers that have spread to lymph nodes (N1, stage IVA) or other organs (M1, stage IVB).[31]

AJCC stage for prostate cancer
AJCC Stage TNM scores Gleason grade group PSA
Stage I T1 or T2, N0, M0 1 <10 ng/mL
Stage IIA T1 or T2, N0, M0 1 10–20 ng/mL
Stage IIB 2
Stage IIC 3 or 4
Stage IIIA T1 or T2, N0, M0 3 or 4 > 20 ng/mL
Stage IIIB T3 or T3, N0, M0 10–20 ng/mL
Stage IIIC T1 or T2, N0, M0 5
Stage IVA Any T, N1 Any group Any PSA
Stage IVB Any T, M1

The United Kingdom National Institute for Health and Care Excellence recommends a five-stage system based on disease prognosis called the Cambridge Prognostic Group, with prognostic groups CPG 1 to CPG 5.[33] CPG 1 is the same as AJCC stage I. Cases with localized tumors (T1 or T2) and either Gleason grade group 2 or higher PSA levels (10 to 20 ng/mL) are designated CPG 2. CPG 3 represents either Gleason grade group 3, or the combination of the CPG 2 criteria. CPG 4 is similar to AJCC stage 3 – any of Gleason grade group 4, PSA levels above 20 ng/mL, or a tumor that has grown beyond the prostate (T3). CPG 5 is for the highest risk cases: either a T4 tumor, Gleason grade group 5, or any two of the CPG 4 criteria.[34]

Prevention

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No drug or vaccine is approved by regulatory agencies for the prevention of prostate cancer. Several studies have shown 5α-reductase inhibitors – both finasteride and dutasteride, which are used to treat non-cancerous enlarged prostate – to reduce the total incidence of prostate cancer; however, it is unclear as of 2022 whether they reduce any cases of dangerous disease.[35]

Management

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Main article: Management of prostate cancer

Treatment of prostate cancer varies based on how advanced the cancer is, the risk it may spread, and the affected person's health and personal preferences.[36] Those with localized disease at low risk for spread are often more likely to be harmed by the side effects of treatment than the disease itself, and so are regularly tested for a worsening of their disease.[37] Those at higher risk may receive treatment to eliminate the tumor – typically prostatectomy (surgery to remove the prostate) or radiation therapy, sometimes alongside hormone therapy.[38] Those with metastatic disease are treated with chemotherapy, as well as radiation or other agents to alleviate the symptoms of metastatic tumors.[38] Blood PSA levels are monitored every few months to assess the effectiveness of treatments, and whether the disease is recurring or advancing.[39]

Localized disease

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A person lies on a table under a large machine.
Setup for radiation therapy. The person lies flat while a radiation beam is focused on the tumor site.

Men diagnosed with low-risk cases of prostate cancer often defer treatment and are monitored regularly for cancer progression by active surveillance, which involves testing for tumor growth at fixed intervals by PSA tests (around every six months), digital rectal exam (annually), and MRI or repeat biopsies (every one to three years).[40] This program continues until increases in PSA levels, Gleason grade, or tumor size indicate a higher-risk tumor that may require intervention.[41] At least half of men remain on active surveillance, never requiring more direct treatment for their prostate tumors.[42]

Those who elect to have therapy receive radiation therapy or a prostatectomy; these have similar rates of cancer control, but different side effects.[43][44] Radiation can be delivered by intensity-modulated radiation therapy (IMRT), which allows for high doses (greater than 80 Gy) to be delivered to the prostate with relatively little radiation to other organs, or by brachytherapy, where a radioactive source is surgically inserted into the prostate.[45][46] IMRT is given over several sessions, with treatments repeated five days per week for several weeks. Brachytherapy is typically performed in a single session, with the radioactive source permanently implanted into the prostate, where it expends its radioactivity within the next few months.[47] With either technique, radiation damage to nearby organs can increase the risk of subsequent bladder cancer and cause erectile dysfunction, infertility, irreversible lumbar plexopathy[48] and radiation proctitis – damage to the rectum that can cause diarrhea, bloody stools, fecal incontinence, and pain.[49]

A surgeon sits with his face surrounded by a computer terminal.
A surgeon performs robot-assisted surgery.

Radical prostatectomy aims to surgically remove the cancerous part of the prostate, along with the seminal vesicles, and the end of the vas deferens (the duct that delivers sperm from the testes).[50] In wealthier countries, this is typically done by robot-assisted surgery, where robotic tools inserted through small holes in the abdomen allow a surgeon to make small and exact movements during surgery.[51] This method results in shorter hospital stays, less blood loss, and fewer complications than traditional open surgery.[51] In places where robot-assisted surgery is unavailable, prostatectomy can be performed laparoscopically (using a camera and hand tools through small holes in the abdomen), or through traditional open surgery with an incision above the penis (retropubic approach) or below the scrotum (perineal approach).[52][51] The four approaches result in similar rates of cancer control.[52] Damage to nearby tissue during surgery can result in erectile dysfunction and urinary incontinence. Erectile dysfunction is more likely in those who are older or had previous erectile issues.[52] Incontinence is more common in those who are older and have shorter urethras.[52] Both for cancer progression outcomes and surgical side effects, the skill and experience of the individual surgeon doing the procedure are among the greatest determinants of success.[52]

After prostatectomy, PSA levels drop rapidly, reaching very low or undetectable levels within two months. Radiotherapy also substantially reduces PSA levels, but more slowly and less completely, with PSA levels reaching their nadir two years after radiotherapy.[53] After either treatment, PSA levels are monitored regularly. Up to half of those treated will eventually have a rise in PSA levels, suggesting the tumor or small metastases are growing again.[54] People with high or rising PSA levels are often offered another round of radiation therapy directed at the former tumor site. This reduces risk for further progression by 75%.[54] Those suspected of metastases can undergo PET scanning with sensitive radiotracers C-11 choline, F-18 fluciclovine, and F-18 or Ga-68 attached to a PSMA-targeting drug, each of which is able to detect small metastases more sensitively than alternative imaging methods.[55][54]

Metastatic disease

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Medical image showing a man's skeleton with several dark spots along the bones
Bone scintigraphy scan of a man with metastatic prostate cancer. Dark spots indicate metastases along the pelvis, ribs, and shoulder.

For those with metastatic disease, the standard of care is androgen deprivation therapy (also called "chemical castration"), drugs that reduce levels of androgens (male sex hormones) which prostate cells require to grow.[56] Various drugs are used to lower androgen levels by blocking the synthesis or action of testosterone, the primary androgen. The first line of treatment typically involves GnRH agonists like leuprolide, goserelin, or triptorelin by injection monthly or less frequently as needed.[57][56] GnRH agonists cause a brief rise in testosterone levels at treatment initiation, which can worsen disease in people with significant symptoms of metastases.[58] In these people, GnRH antagonists like degarelix or relugolix are given instead, and can also rapidly reduce testosterone levels.[58] Reducing testosterone can cause various side effects, including hot flashes, reduction in muscle mass and bone density, reduced sex drive, fatigue, personality changes, and an increased risk of diabetes, cardiovascular disease, and depression.[58] Hormone therapy halts tumor growth in more than 95% of those treated,[59] and PSA levels return to normal in up to 70%.[60]

Despite reduced testosterone levels, metastatic prostate tumors eventually continue to grow – manifested by rising blood PSA levels, and metastases to nearby bones.[61][62] This is the most advanced stage of the disease, called castration-resistant prostate cancer (CRPC). CRPC tumors continuously evolve resistance to treatments, necessitating several lines of therapy, each used in sequence to extend survival.[63] The standard of care is the chemotherapy docetaxel along with antiandrogen drugs, namely the androgen receptor antagonists enzalutamide, apalutamide, and darolutamide, as well as the testosterone production inhibitor abiraterone acetate.[64][61][65] An alternative is the cell therapy procedure Sipuleucel-T, where the affected person's immune cells are removed, treated to more effectively target prostate cancer cells, and re-injected.[61] Tumors that evolve resistance to docetaxel may receive the second-generation taxane drug cabazitaxel.[61]

Some CRPC treatments are used only in men whose tumors have certain characteristics that make the therapy more likely to be effective. Men whose tumors express the protein PSMA may receive the radiopharmaceutical Lu-177 PSMA, which binds to and destroys PSMA-positive cells.[66][61] Those whose tumors have defective DNA damage repair benefit from treatment with the immune checkpoint inhibitor drug pembrolizumab and PARP inhibitors, namely olaparib, rucaparib, or niraparib.[61]

Supportive care

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Bone metastases – present in around 85% of those with metastatic prostate cancer – are the primary cause of symptoms and death from metastatic prostate cancer.[67][7] Those with constant pain are prescribed nonsteroidal anti-inflammatory drugs.[68] However, people with bone metastases can experience "breakthrough pain", sudden bursts of severe pain that resolve within around 15 minutes, before pain medications can take effect.[68] Single sites of pain can be treated with external beam radiation therapy to shrink nearby tumors.[69] More dispersed bone pain can be treated with radioactive compounds that disproportionately accumulate in bone, like radium-223 and samarium-153-EDTMP, which help reduce the size of bone tumors. Similarly, the systemic chemotherapeutics used for metastatic prostate cancer can reduce pain as they shrink tumors.[69] Other bone modifying agents like zoledronic acid and denosumab can reduce prostate cancer bone pain, even though they have little effect on tumor size.[69] Metastases compress the spinal cord in up to 12% of those with metastatic prostate cancer causing pain, weakness, numbness, and paralysis.[70][71] Inflammation in the spine can be treated with high-dose steroids, as well as surgery and radiotherapy to shrink spinal tumors and relieve pressure on the spinal cord.[70][71]

Those with advanced prostate cancer suffer fatigue, lethargy, and a generalized weakness. This is caused in part by gastrointestinal problems, with loss of appetite, weight loss, nausea, and constipation all common. These are typically treated with appetite-increasing drugs – megestrol acetate or corticosteroids – antiemetics, or treatments that focus on underlying gastrointestinal issues.[72] General weakness can also be caused by anemia, itself caused by a combination of the disease itself, poor nutrition, and damage to the bone marrow from cancer treatments or bone metastases.[73] Anemia can be treated in various ways depending on the cause, or can be addressed directly with blood transfusions.[73] Organ damage and metastases in the lymph nodes can lead to uncomfortable accumulation of fluid (called lymphedema) in the genitals or lower limbs. These swellings can be extremely painful, curtailing an affected person's ability to urinate, have sex, or walk normally. Lymphedema can be treated by applying pressure to aid drainage, surgically draining pooled fluid, and cleaning and treating nearby damaged skin.[74]

People with prostate cancer are around twice as likely to experience anxiety or depression compared to those without cancer.[75] When added to normal prostate cancer treatments, psychological interventions such as psychoeducation and cognitive behavioral therapy can help reduce anxiety, depression, and general distress.[76]

As those severely ill with metastatic prostate cancer approach the end of their lives, most experience confusion and may hallucinate or have trouble recognizing loved ones.[77][78] Confusion is caused by various conditions, including kidney failure, sepsis, dehydration, and as a side effect of various drugs, especially opioids.[77] Most people sleep for long periods, and some feel drowsy when awake.[78] Restlessness is also common, sometimes caused by physical discomfort from constipation or urinary retention, sometimes caused by anxiety.[78] In their last few days, affected men's breathing may become shallow and slow, with long pauses between breaths. Breathing may be accompanied by a rattling noise as fluid lingers in the throat, but this is not uncomfortable for the affected person.[78][79] Their hands and feet may cool to the touch, and skin become blotchy or blue due to weaker blood circulation. Many stop eating and drinking, resulting in dry-feeling mouth, which can be aided by moistening the mouth and lips.[78] The person becomes less and less responsive, and eventually the heart and breathing stop.[79]

Prognosis

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The prognosis of diagnosed prostate cancer varies widely based on the cancer's grade and stage at the time of diagnosis; those with lower stage disease have vastly improved prognoses. Around 80% of prostate cancer diagnoses are in men whose cancer is still confined to the prostate. These men can survive long after diagnosis, with as many as 99% still alive 10 years from diagnosis.[80] Men whose cancer has metastasized to a nearby part of the body (around 15% of diagnoses) have poorer prognoses, with five-year survival rates of 60–80%.[1] Those with metastases in distant body sites (around 5% of diagnoses) have relatively poor prognoses, with five-year survival rates of 30–40%.[1]

Those who have low blood PSA levels at diagnosis, and whose tumors have a low Gleason grade and less-advanced clinical stage tend to have better prognoses.[81] After prostatectomy or radiotherapy, those who have a short time between treatment and a subsequent rise in PSA levels, or quickly rising PSA levels are more likely to die from their cancers.[54] Castration-resistant metastatic prostate cancer is incurable,[82] and kills a majority of those whose disease reaches this stage.[61]

Cause

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Prostate cancer is caused by the accumulation of genetic mutations to the DNA of cells in the prostate. These mutations affect genes involved in cell growth, replication, cell death, and DNA damage repair.[83] With these processes dysregulated, some cells replicate abnormally, forming a clump of cells called a tumor.[84] As the tumor grows, its cells accumulate more mutations, allowing it to stimulate the growth of new blood vessels to support further growth.[85] Eventually, a tumor can grow large enough to invade nearby organs such as the seminal vesicles or bladder.[86] In advanced tumors, cells can develop the ability to detach from their original tissue site, and evade the immune system.[85] These cells can spread through the lymphatic system to nearby lymph nodes, or through the bloodstream to the bone marrow and (more rarely) other body sites.[85] At these new sites, the cancer cells disrupt normal body function and continue to grow. Metastases cause most of the discomfort associated with prostate cancer, and can eventually kill the affected person.[85]

Pathophysiology

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Most prostate tumors begin in the peripheral zone – the outermost part of the prostate.[87] As cells begin to grow out of control, they form a small clump of dysregulated cells called a prostatic intraepithelial neoplasia (PIN).[88] Some PINs continue to grow, forming layers of tissue that stop expressing genes common to their original tissue location – p63, cytokeratin 5, and cytokeratin 14 – and instead begin expressing genes typical of cells in the innermost lining of the pancreatic duct (cytokeratin 8 and cytokeratin 18).[87] These multilayered PINs also often overexpress the gene AMACR, which is associated with prostate cancer progression.[87]

Some PINs can eventually grow into tumors.[88] This is commonly accompanied by large-scale changes to the genome, with chromosome sequences being rearranged or copied repeatedly. Some genomic alterations are particularly common in early prostate cancer, namely gene fusion between TMPRSS2 and the oncogene ERG (up to 60% of prostate tumors), mutations that disable SPOP (up to 15% of tumors), and mutations that hyperactivate FOXA1 (up to 5% of tumors).[87]

Metastatic prostate cancer tends to have more genetic mutations than localized disease.[89] Many of these mutations are in genes that protect from DNA damage, such as p53 (mutated in 8% of localized tumors, more than 27% of metastatic ones) and RB1 (1% of localized tumors, more than 5% of metastatic ones).[89] Similarly mutations in the DNA repair-related genes BRCA2 and ATM are rare in localized disease but found in at least 7% and 5% of metastatic disease cases respectively.[89]

The transition from castrate-sensitive to castrate-resistant prostate cancer is also accompanied by the acquisition of various gene mutations. In castrate-resistant disease, more than 70% of tumors have mutations in the androgen receptor signaling pathway – amplifications and gain-of-function mutations in the receptor gene itself, amplification of its activators (for example, FOXA1), or inactivating mutations in its negative regulators (for example, ZBTB16 and NCOR1).[89] These androgen receptor disruptions are found in only up to 6% of biopsies of castrate-sensitive metastatic disease.[89] Similarly, deletions of the tumor suppressor PTEN are harbored by 12–17% of castrate-sensitive tumors, but more than 40% of castrate-resistant tumors.[89] Less commonly, tumors have aberrant activation of the Wnt signaling pathway via disruption of members APC (9% of tumors) or CTNNB1 (4% of tumors); or dysregulation of the PI3K pathway via PI3KCA/PI3KCB mutations (6% of tumors) or AKT1 (2% of tumors).[89]

Epidemiology

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Graph showing that prostate cancer incidence is very low in men under 50, and peaks in men over 65
Prostate cancer incidence by age group, United States, 2016[note 2]

Prostate cancer is the second-most frequently diagnosed cancer in men, and the second-most frequent cause of cancer death in men (after lung cancer).[2][3] Around 1.2 million new cases of prostate cancer are diagnosed each year, and more than 350,000 people die of the disease annually.[2] One in eight men are diagnosed with prostate cancer in their lifetime, and around one in forty die of the disease.[3] Rates of prostate cancer rise with age. Due to this, prostate cancer rates are generally higher in parts of the world with higher life expectancy, which also tend to be areas with higher gross domestic product and higher human development index.[2] Australia, Europe, North America, New Zealand, and parts of South America have the highest incidence. South Asia, Central Asia, and sub-Saharan Africa have the lowest incidence of prostate cancer; though incidence is increasing quickly in these regions.[2] Prostate cancer is the most diagnosed cancer in men in more than half of the world's countries, and the leading cause of cancer death in men in around a quarter of countries.[91]

Prostate cancer is rare in those under 40 years old,[92] and most cases occur in those over 60 years,[2] with the average person diagnosed at 67.[93] The average age of those who die from prostate cancer is 77.[93] Only a minority of prostate cancer cases are diagnosed. Autopsies of men who died at various ages have shown cancer in the prostates of more than 40% of men over age 50. Incidence rises with age, and nearly 70% of men autopsied at age 80–89 had cancer in their prostates.[94]

Genetics

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Prostate cancer is more common in families with a history of any cancer.[95] Men with an affected first-degree relative (father or brother) have more than twice the risk of developing prostate cancer, and those with two first-degree relatives have a five-fold greater risk compared with men with no family history.[96] Increased risk also runs in some ethnic groups, with men of African and African-Caribbean ancestry at particularly high risk – having prostate cancer at higher rates, and having more-aggressive prostate cancers that develop at earlier ages.[97] Large genome-wide association studies have identified more than a hundred gene variants associated with increased prostate cancer risk.[95] The greatest risk increase is associated with variations in BRCA2 (up to an eight-fold increased risk) and HOXB13 (three-fold increased risk), both of which are involved in repairing DNA damage.[95] Variants in other genes involved in DNA damage repair have also been associated with an increased risk of developing prostate cancer – particularly early-onset prostate cancer – including BRCA1, ATM, NBS1, MSH2, MSH6, PMS2, CHEK2, RAD51D, and PALB2.[95] Additionally, variants in the genome near the oncogene MYC are associated with increased risk.[95] As are single-nucleotide polymorphisms in the vitamin D receptor common in African-Americans, and in the androgen receptor, CYP3A4, and CYP17 involved in testosterone synthesis and signaling.[96] Together, known gene variants are estimated to cause around 25% of prostate cancer cases, including 40% of early-onset prostate cancers.[96]

Body and lifestyle

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Men who are taller are at a slightly increased risk for developing prostate cancer, as are men who are obese.[98] High levels of blood cholesterol are also associated with increased prostate cancer risk; consequently, those who take the cholesterol-lowering drugs, statins, have a reduced risk of advanced prostate cancer.[99] Chronic inflammation can cause various cancers. Potential links between infection (or other sources of inflammation) and prostate cancer have been studied but none definitively found, and one large study found no link between prostate cancer and a history of gonorrhea, syphilis, chlamydia, or infection with various human papillomaviruses.[100]

Regular vigorous exercise may reduce one's chance of developing advanced prostate cancer, as can several dietary interventions.[101] Those with a diet rich in cruciferous vegetables (certain leafy greens, broccoli, and cauliflower), fish, genistein (found in soy), or lycopene (found in tomatoes) are at a reduced risk of symptomatic prostate cancer.[96][102] Conversely, those who consume high levels of dietary fats, polycyclic aromatic hydrocarbons (from cooking red meats), or calcium may be at an increased risk of developing advanced prostate cancer.[96][103] Several dietary supplements have been studied and found not to impact prostate cancer risk, including selenium, vitamin C, vitamin D, and vitamin E.[35][103]

Special populations

[edit]

Transgender women and gender non-conforming people who have prostates can develop prostate cancer. Those who have undergone gender-affirming hormone therapy or gender-affirming surgery have reduced risk of developing prostate cancer, relative to cisgender men of similar age.[104] Screening tests in this group are complicated, as transgender women may have lower PSA levels than cisgender men due to their reduced testosterone levels.[105] PSA levels greater than 1 ng/mL are generally considered above normal by gender care specialists.[106] Digital rectal exams of the prostate are often impossible in transgender women who have undergone vaginoplasty, as the length and rigidity of the new vagina can obstruct access to the prostate from the rectum.[106]

History

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Huggins's headshot
Charles Huggins

A prostate mass was first described in 1817 by the English surgeon George Langstaff, following the autopsy of a man who had died at age 68 with lower-body pain and urinary issues.[107][108] In 1853, London Hospital surgeon John Adams described another prostate tumor from a man who had died with urinary issues; Adams had a pathologist examine the tumor, providing the first confirmed case of a cancerous tumor in the prostate.[107][109] The disease was initially rarely described; an 1893 report found only 50 cases described in the medical literature.[110] Around the turn of the 19th century, prostate surgery to relieve urinary obstruction became more common, allowing surgeons and pathologists to examine the removed prostate tissue. Two studies around the time found cancer in as many as 10% of surgical specimens, suggesting prostate cancer was a fairly common cause of prostate enlargement.[110]

For much of the 20th century, the primary therapy for prostate cancer was surgery to remove the prostate. Perineal prostatectomy was first performed in 1904 by Hugh H. Young at Johns Hopkins Hospital.[111][112] Young's method became the widespread standard, initially done primarily to relieve symptoms of urinary blockage.[111] In 1931 a new surgical method, transurethral resection of the prostate, became available, replacing perineal prostatectomy for symptomatic relief of obstruction.[110] In 1945, Terence Millin described a retropubic prostatectomy approach, which provided easier access to pelvic lymph nodes to assist in staging the extent of disease, and was easier for surgeons to learn.[111] This was improved upon by Patrick C. Walsh's 1983 description of a retropubic prostatectomy approach that avoided damage to the nerves near the prostate, preserving erectile function.[111][113]

Radiation therapy for prostate cancer was used occasionally in the early 20th century, with radium implanted into the urethra or rectum to reduce the tumor size and associated symptoms.[114] In the 1950s the advent of more powerful radiation machines allowed for external beam radiotherapy to reach the prostate. By the 1960s, this was often combined with hormone therapy to improve the potency of therapy.[114] In the 1970s, Willet Whitmore pioneered an open surgery technique where needles of Iodine-125 were placed directly into the prostate. This was improved upon by Henrik H. Holm in 1983 by using transrectal ultrasound to guide the implantation of radioactive material.[114]

The observation that the testicles (and the hormones they secrete) influence prostate size was made as early as the late 18th century via castration experiments in animals. However, occasional experimentation over the next century bore mixed results, likely due to the inability to separate prostate tumors from prostates enlarged due to benign prostatic hyperplasia. In 1941, Charles Huggins and Clarence V. Hodges published two studies using surgical castration or oral estrogen to reduce androgen levels and improve prostate cancer symptoms. Huggins was awarded the 1966 Nobel Prize in Physiology or Medicine for this discovery, the first systemic therapy for prostate cancer.[115][116] In the 1960s, large studies showed estrogen therapy to be as effective as surgical castration at treating prostate cancer, but that those on estrogen therapy were at increased risk of suffering blood clots.[115] Through the 1980s, Andrzej W. Schally's studies of GnRH led to the development of GnRH agonists, which were found to be as effective as estrogen without the increased risk of clotting.[115][117] Schally was awarded the 1977 Nobel Prize in Physiology or Medicine for his work on GnRH and prostate cancer.[115]

Systemic chemotherapy for prostate cancer has been studied since the 1950s but clinical trials failed to show benefits in most people who receive the drugs.[118] In 1996, the US Food and Drug Administration approved the systemic chemotherapy mitoxantrone for those with castration-resistant prostate cancer based on trials showing that it improved symptoms even though it failed to enhance survival.[119] In 2004, docetaxel was approved as the first chemotherapy to increase survival in those with castration-resistant prostate cancer.[119] After additional trials in 2015, docetaxel use was extended to those with castration-sensitive prostate cancer.[120]

Society and culture

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The light blue ribbon is a symbol to show support for prostate cancer awareness

Prostate cancer screening and awareness have been widely promoted since the early 2000s by Prostate Cancer Awareness Month in September and Movember in November.[121] However, an analysis of internet searches suggests neither event changes the level of prostate cancer interest or discussion much, in contrast to the more established Breast Cancer Awareness Month.[121]

Research

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Prostate cancer is a major topic of ongoing research. From 2016 to 2020, more than $1.26 billion was invested in prostate cancer research, representing around 5% of global cancer research funds.[122] This places prostate cancer 10th among 18 common cancer types in funding per cancer death, and 9th in funding per disability-adjusted life year lost.[123]

Research into prostate cancer relies on a number of laboratory models to test aspects of the disease. Several prostate immortalized cell lines are widely used, namely the classic lines DU145, PC-3, and LNCaP, as well as more recent cell lines 22Rv1, LAPC-4, VCaP, and MDA-PCa-2a and −2b.[124] Research requiring more complex models of the prostate uses organoids – clusters of prostate cells that can be grown from human prostate tumors or stem cells.[125] Modeling tumor growth and metastasis requires a model organism, typically a mouse. Researchers can either surgically implant human prostate tumors into immunocompromised mice (a technique called a patient derived xenograft),[126] or induce prostate tumors in mice with genetic engineering.[127] These genetically engineered mouse models typically use a Cre recombinase system to disrupt tumor suppressors or activate oncogenes specifically in prostate cells.[128]

As of 2024 studies exploring the relationship between ejaculation frequency and prostate cancer risk are inconclusive and age, urinary health, and lifestyle are important factors to consider.[129][130]

Notes

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References

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[edit]
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Prostate cancer

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from Grokipedia
Prostate cancer is a malignancy that originates in the cells of the prostate gland, a small walnut-sized organ in the male reproductive system responsible for producing seminal fluid, located just below the bladder and in front of the rectum.[1] It is the most common cancer in men (excluding skin cancer) and the second leading cause of cancer death among American men, with an estimated 313,780 new cases and 35,770 deaths in the United States in 2025. Globally, prostate cancer is the second most common cancer in men, with an estimated 1,467,854 new cases in 2022.[2][3] The majority of cases are adenocarcinomas, which develop from glandular cells, though rare types include small cell carcinomas, neuroendocrine tumors, sarcomas, and transitional cell carcinomas.[4] While many prostate cancers grow slowly and may not cause serious harm during a man's lifetime, others can be aggressive and spread to other parts of the body, such as the bones or lymph nodes.[5] Several risk factors contribute to the development of prostate cancer, with age being the most significant, as the disease is rare in men under 40 and the risk increases rapidly after age 50, with about 60% of cases diagnosed in men over 65.[6] Race and ethnicity also play a role, with higher incidence and mortality rates among African American men and those of Caribbean descent compared to non-Hispanic White, Hispanic, Latino, or Asian American men.[6] A family history doubles the risk if a father or brother has been affected, and inherited gene mutations such as BRCA1, BRCA2, or those associated with Lynch syndrome further elevate susceptibility, though they account for only a small percentage of cases.[6] Other potential factors include high dietary intake of dairy or calcium, obesity (linked to more aggressive forms), prostate inflammation (prostatitis), and certain chemical exposures like Agent Orange, though evidence for diet, smoking, vasectomy, and sexually transmitted infections remains inconclusive or mixed.[6] However, prostate cancer itself is not contagious. It cannot be transmitted sexually to a partner through sexual contact, bodily fluids, or close physical interaction, and there is no risk to partners from sexual activity with someone who has prostate cancer.[7] Early-stage prostate cancer often produces no symptoms, but as it progresses, common signs include difficulty urinating, weak or interrupted urine flow, frequent urination (especially at night), blood in the urine or semen, erectile dysfunction, and bone or back pain in advanced cases.[5] Diagnosis typically begins with screening tests such as the prostate-specific antigen (PSA) blood test, which measures PSA levels (elevated levels above 4 ng/mL may indicate risk), and the digital rectal exam (DRE), where a doctor palpates the prostate for lumps or abnormalities.[8] Confirmation requires a prostate biopsy, often guided by transrectal ultrasound (TRUS) or magnetic resonance imaging (MRI), to determine the cancer's grade using the Gleason score or Grade Groups (1-5), with higher scores indicating more aggressive disease.[8] Additional imaging, such as bone scans, CT scans, or PSMA PET scans, assesses the stage (I-IV) based on tumor size, spread to lymph nodes or distant sites, and PSA levels.[5] Treatment for prostate cancer depends on the stage, grade, patient's age, overall health, and preferences, with options including active surveillance or watchful waiting for low-risk, slow-growing cancers and select patients with favorable intermediate-risk disease (typically Gleason 3+4 with limited pattern 4, PSA 10-20 ng/mL, and other favorable features), particularly those with limited life expectancy, comorbidities, or preference to avoid treatment side effects.[9][10] For localized disease, surgery (radical prostatectomy to remove the prostate) or radiation therapy (external beam or brachytherapy) are common, while advanced or metastatic cases may involve hormone therapy (androgen deprivation to block male hormones fueling cancer growth), chemotherapy, targeted therapy, or immunotherapy.[5] Emerging approaches include clinical trials for cryosurgery, proton beam therapy, and bisphosphonates for bone metastases.[5] Prognosis is generally favorable, with a 5-year relative survival rate near 98% overall, though it drops to about 37% for distant metastatic disease; death rates have declined by roughly 50% since 1993 due to improved detection and treatments.[11][3]

Epidemiology and risk factors

Incidence and prevalence

Prostate cancer represents a major global health burden, with an estimated 1.5 million new cases diagnosed worldwide in 2022, ranking it as the second most common cancer in men after lung cancer. Globally, the age-standardized incidence rate was 29.4 per 100,000 men in 2022, with approximately 397,000 deaths attributed to the disease that year. Projections from recent models indicate a continued rise in cases due to aging populations and diagnostic improvements, potentially approaching 1.6 million new cases by 2025.[12] Incidence varies markedly by region, reflecting differences in screening uptake, genetics, and lifestyle factors. The highest age-standardized rates exceed 100 per 100,000 men in Northern America (111.7) and Oceania (100.3), followed closely by Western Europe (94.4), while rates remain lower in Asia (12.7) and Africa (22.0) as of 2022, though increasing trends are observed in these areas due to westernized diets and better healthcare access. In the United States, approximately 314,000 new cases are projected for 2025, with incidence rates stabilizing around 118 per 100,000 men after an initial decline following the 2012 U.S. Preventive Services Task Force recommendations against routine PSA screening, followed by a 3% annual increase since 2014 driven by rebound in targeted screening.[2][13][14] Mortality from prostate cancer stands at about 400,000 deaths annually worldwide, with age-standardized rates of 7.3 per 100,000 men in 2022; however, survival outcomes differ by stage at diagnosis, approaching 100% for five-year relative survival in localized cases but dropping to 37% for metastatic disease. The disease predominantly affects older men, being rare before age 40 and accounting for over 60% of cases in those aged 65 and older, with a median age at diagnosis of 66 years. These patterns underscore the importance of age-targeted detection strategies in high-incidence regions.[12][15][3]

Demographic risk factors

Age is the most significant demographic risk factor for prostate cancer, with the disease being rare in men under 40 and incidence rising sharply thereafter. Approximately 60% of cases are diagnosed in men aged 65 or older, and the average age at diagnosis is 66 years. The risk approximately doubles every decade after age 50, reflecting cumulative exposure to environmental and hormonal factors over time. Racial and ethnic disparities in prostate cancer incidence and mortality are pronounced, with Black or African American men experiencing the highest rates in the United States. The age-adjusted incidence rate among Black men is about 1.7 times higher than among White men (191.5 versus 114.6 per 100,000 during 2018–2022), and mortality is more than twice as high.[16] In contrast, Asian and Hispanic men have lower incidence rates compared to White and Black men, though these vary by subgroup and region. A family history of prostate cancer in first-degree relatives (father, brother, or son) increases a man's risk 2- to 3-fold, independent of specific genetic mutations, likely due to shared environmental and lifestyle exposures within families. This elevated risk persists even after accounting for hereditary factors. Prostate cancer incidence is substantially higher in developed nations, such as those in North America, Western Europe, and Australia/New Zealand, where age-adjusted rates exceed 80–100 per 100,000 men, compared to under 20 per 100,000 in many Asian and African countries. These geographic variations correlate with lifestyle factors, including diets high in saturated fats and red meat, which are associated with a 10–20% increased risk of prostate cancer overall. Obesity, defined as a body mass index greater than 30 kg/m², further elevates the risk of aggressive disease by 20–30%, possibly through altered hormone levels and inflammation. Additionally, observational evidence suggests that higher ejaculation frequency may be associated with a reduced risk of prostate cancer. A 2025 updated dose-response meta-analysis of 29 studies involving 315,193 participants found a significant protective association with higher ejaculation frequency (pooled OR 0.83, 95% CI 0.77-0.90), while other sexual activity factors showed no significant associations, though causality remains unestablished.[17] Prostate cancer is not a contagious disease and cannot be spread through sexual activity or contact with bodily fluids.[7] Among Latino men in the United States, successive generations born in the country exhibit increasing rates of aggressive prostate cancer compared to foreign-born immigrants, attributed to acculturation toward Western diets and lifestyles.

Genetic and hereditary factors

Hereditary factors account for approximately 5-10% of prostate cancer cases, distinguishing them from sporadic forms through identifiable germline mutations that confer elevated risk.[18] These inherited syndromes often involve genes critical to DNA repair and cell cycle regulation, leading to a predisposition toward cancer development at younger ages or with more aggressive features.[19] Among the most studied hereditary contributors are mutations in the BRCA1 and BRCA2 genes, which are associated with hereditary breast and ovarian cancer syndrome but also significantly increase prostate cancer risk. Germline BRCA2 mutations elevate the lifetime risk by 4.7- to 8.6-fold, particularly for aggressive disease characterized by high Gleason scores and metastasis.[20] BRCA1 mutations confer a more modest 2- to 3-fold increase in risk, though they are linked to earlier-onset and potentially more lethal prostate cancers compared to non-carriers.[21] These mutations impair homologous recombination repair, promoting genomic instability that drives oncogenesis.[22] Common genetic variants also play a key role in prostate cancer susceptibility, with the HOXB13 G84E mutation standing out as a founder variant in certain populations, raising lifetime risk to about 62% by age 85 in carriers versus 15% in non-carriers.[23] Similarly, variants at the 8q24 locus, a gene-poor region with regulatory elements, are associated with a 1.6-fold overall risk increase and up to 1.85-fold for high-grade tumors.[24] Polygenic risk scores (PRS), which aggregate effects from hundreds of such common variants, can explain substantial variation in lifetime risk; for instance, individuals in the top 1% of PRS distribution face a 4-fold higher risk compared to the general population.[25] Germline mutations in DNA mismatch repair (MMR) genes, such as MLH1, MSH2, MSH6, and PMS2, underlie Lynch syndrome and are linked to a 2- to 3-fold elevated prostate cancer risk, often presenting with higher Gleason scores indicative of aggressive pathology.[26] These defects lead to microsatellite instability, a hallmark that distinguishes Lynch-associated prostate cancers and may influence prognosis.[27] Ethnic differences in genetic risk are pronounced, with men of African ancestry showing higher frequencies of certain risk alleles, including those at 8q24 and novel loci, contributing to more aggressive disease forms and earlier onset.[28] This disparity underscores the need for ancestry-informed genetic profiling. As of 2025, genomic research has identified new germline variants in at least five DNA damage repair genes (e.g., BRCA2, ATM, CHEK2) enriched in metastatic prostate cancer, particularly among African descent populations, enhancing PRS models for better risk stratification.[29] Increased adoption of polygenic testing is enabling earlier risk assessment and personalized screening guidelines.[30]

Pathophysiology

Anatomy and histology of the prostate

The prostate gland is a walnut-sized, pyramid-shaped organ located in the male pelvis, inferior to the urinary bladder and surrounding the proximal portion of the urethra.[31] It is enclosed by a thin, fibrous capsule and consists of an inverted cone with its base adjacent to the bladder neck and its apex pointing toward the external urethral sphincter.[31] Anatomically, the prostate is divided into distinct zones: the peripheral zone, which constitutes approximately 70% of the glandular tissue and surrounds the distal urethra; the central zone, located at the base and encircling the ejaculatory ducts; the smaller transition zone, which surrounds the proximal urethra near the bladder; and the anterior fibromuscular stroma, a non-glandular region composed of muscle and fibrous tissue at the apex.[31] These zones arise from epithelial buds that extend into the urogenital mesenchyme during embryonic development, forming ducts and acini that contribute to the gland's overall structure.[32] Histologically, the prostate is composed of glandular epithelium and fibromuscular stroma.[32] The glandular components include acini and ducts lined by a pseudostratified epithelium featuring luminal secretory cells with columnar morphology and pale eosinophilic cytoplasm, basal cells situated near the basement membrane with ovoid nuclei, and scattered neuroendocrine cells.[32] Basal cells can be identified via immunohistochemical markers such as p63 and high-molecular-weight cytokeratins.[32] The stroma, which surrounds the glands, is rich in smooth muscle cells, fibroblasts, blood vessels, and nerves, lacking adipose tissue and providing structural support.[32] Prostate growth and maintenance are androgen-dependent, primarily driven by testosterone, which is converted locally to the more potent dihydrotestosterone (DHT) by the enzyme 5α-reductase, enabling androgen receptor signaling essential for glandular development and function.[33][34] The prostate's primary function is to produce a clear, alkaline fluid that constitutes 25-30% of seminal volume, aiding in sperm nourishment, protection, and propulsion during ejaculation.[35] This prostatic secretion contains enzymes such as prostate-specific antigen (PSA), secreted by luminal epithelial cells, which liquefies the ejaculate by proteolytically cleaving semenogelins from seminal vesicles.[32] The gland's muscular components also contract during ejaculation to expel the fluid into the urethra.[31] With aging, the prostate undergoes changes including benign prostatic hyperplasia (BPH), a non-malignant nodular enlargement primarily affecting the transition zone, which can compress the urethra and lead to urinary symptoms such as frequency and weak stream.[31] BPH is distinct from cancerous growth and is influenced by androgens, though its precise mechanisms involve stromal-epithelial interactions.[31]

Mechanisms of carcinogenesis

Prostate cancer most commonly originates from the glandular epithelial cells of the peripheral zone, accounting for approximately 70% of cases.[36] Prostate cancer carcinogenesis begins with the initiation phase, where dysregulation of androgen receptor (AR) signaling plays a central role in transforming normal prostate epithelial cells. Androgens bind to AR, promoting cell proliferation and survival through downstream gene expression; however, aberrant AR activation, often due to hypersensitivity or ligand-independent signaling, drives uncontrolled growth in prostatic intraepithelial neoplasia (PIN), a precursor lesion.[37] A key initiating event is the TMPRSS2-ERG gene fusion, occurring in approximately 50% of prostate cancer cases through genomic rearrangements such as interstitial deletions on chromosome 21q22. This fusion juxtaposes the androgen-responsive TMPRSS2 promoter with the ETS transcription factor ERG, leading to ERG overexpression that alters gene expression profiles favoring oncogenesis, including enhanced cell invasion and reduced apoptosis.[38] Progression to invasive cancer involves the accumulation of somatic mutations that further disrupt tumor suppressor pathways. Loss of PTEN, a phosphatase that negatively regulates the PI3K/AKT pathway, occurs in up to 40-50% of advanced cases and promotes cell survival and proliferation by hyperactivating AKT signaling. Similarly, TP53 inactivation, seen in about 20-30% of primary tumors and more frequently in metastatic disease, impairs DNA repair and apoptosis, accelerating genomic instability. In castration-resistant prostate cancer (CRPC), progression occurs via AR amplification in over 30% of cases, enabling sustained AR signaling despite androgen deprivation therapy and fueling tumor growth through increased AR copy number and transcriptional activity.[39][40] The tumor microenvironment contributes significantly to carcinogenesis by fostering a supportive niche for tumor growth and spread. Chronic inflammation, often triggered by conditions like prostatitis, recruits immune cells that release cytokines and growth factors, promoting epithelial-mesenchymal transition and immune evasion. This inflammatory milieu upregulates vascular endothelial growth factor (VEGF), which drives angiogenesis by stimulating endothelial cell proliferation and vessel formation, thereby supplying nutrients and oxygen to the expanding tumor mass. VEGF-mediated angiogenesis also facilitates metastasis, as newly formed vessels provide routes for cancer cell dissemination to distant sites like bone.[41] Gleason grading reflects the histological dedifferentiation during carcinogenesis, correlating with molecular alterations and clinical aggressiveness. The system evaluates architectural patterns of glandular structures: pattern 1 and 2 represent well-formed glands resembling normal prostate tissue; pattern 3 shows discrete but irregular glands; pattern 4 includes fused or cribriform glands indicating partial loss of differentiation; and pattern 5 features sheets or single cells with no glandular formation, signifying complete dedifferentiation. The Gleason score, summing the two most prevalent patterns (ranging from 6 to 10), predicts aggressiveness, with scores of 8-10 associated with rapid progression and poor outcomes due to heightened genomic instability and invasive potential.[42] Recent insights as of 2025 highlight the role of epigenetic modifications, particularly DNA methylation, in early carcinogenesis within PIN lesions. Hypermethylation of promoter regions silences tumor suppressor genes like GSTP1 and PTEN, leading to their reduced expression and facilitating the transition from PIN to invasive cancer by promoting genomic instability and AR-independent growth pathways. These changes are detectable in precursor lesions and offer potential biomarkers for early detection, with studies showing distinct methylation profiles distinguishing indolent from aggressive disease trajectories.[43]

Clinical presentation

Signs and symptoms

Prostate cancer in its early stages is typically asymptomatic, often discovered incidentally through screening tests rather than due to patient-reported symptoms.[44] When symptoms do occur in localized disease, they may include urinary hesitancy, weak or interrupted urine stream, increased urinary frequency (particularly at night, known as nocturia), painful or burning urination, difficulty fully emptying the bladder, blood in the urine or semen, erectile dysfunction, and painful ejaculation.[45][44] In contrast, penile pain and discharge, particularly when worse on erection and without dysuria, are not typical symptoms of prostate cancer; these are more commonly associated with conditions such as prostatitis, urethritis, or sexually transmitted infections. These local symptoms arise from obstruction of the urethra by the enlarging prostate tumor and can overlap with those of benign prostatic hyperplasia (BPH) or prostatitis.[46] In advanced disease, symptoms become more pronounced as the cancer spreads beyond the prostate. Common manifestations include blood in the urine (hematuria) or semen, painful urination or ejaculation, and erectile dysfunction due to local invasion or treatment effects.[44] Metastatic spread, particularly to bones—which occurs in approximately 80-90% of cases of advanced prostate cancer—frequently causes persistent bone pain, most often in the back, hips, pelvis, or thighs, along with unexplained fatigue, unintentional weight loss, leg swelling or weakness, nausea, and loss of appetite.[47][44] Lymph node involvement may lead to lower extremity edema from obstructed lymphatic drainage.[46] These symptoms are not specific to prostate cancer and individuals experiencing them should consult a healthcare professional for evaluation. Paraneoplastic syndromes are rare in prostate cancer, occurring more commonly in neuroendocrine or small cell variants, and may include hypercalcemia (from tumor secretion of parathyroid hormone-related protein) or coagulopathy such as disseminated intravascular coagulation.[48] In metastatic cases, neurogenic symptoms like peripheral neuropathy, often resulting from tumor compression of nerves or paraneoplastic immune responses, leading to numbness, tingling, or weakness in the limbs.[49]

Differential diagnosis

The differential diagnosis for prostate cancer primarily involves conditions that produce similar lower urinary tract symptoms (LUTS), such as hesitancy, weak stream, and nocturia, or that elevate prostate-specific antigen (PSA) levels, necessitating careful clinical evaluation to distinguish them.[36][50] Among benign conditions, benign prostatic hyperplasia (BPH) is the most common mimic, causing prostate enlargement and LUTS due to urethral compression without malignant transformation.[51] BPH typically presents with a diffusely enlarged, smooth prostate on digital rectal examination (DRE), in contrast to the hard, irregular nodules suggestive of cancer.[36] Prostatitis, particularly acute bacterial forms, can also imitate prostate cancer through inflammation-induced PSA elevation and LUTS, but it is distinguished by associated fever, dysuria, perineal pain, and prostate tenderness on DRE. Penile pain and discharge (worse on erection, no dysuria) are not typical symptoms of prostate cancer and are more commonly associated with conditions like prostatitis, urethritis, or sexually transmitted infections.[36][52][53][46] Other malignancies to consider include bladder cancer, which often dominates with gross hematuria and irritative voiding symptoms rather than obstructive LUTS, potentially involving the prostate secondarily via urothelial carcinoma extension.[36] Advanced rectal cancer may mimic prostate cancer if it spreads locally to the prostate or causes similar pelvic symptoms, though it more commonly presents with rectal bleeding or tenesmus.[54] Non-cancerous causes encompass urethral stricture, which leads to obstructive LUTS from scarring (often post-infectious or traumatic) without prostate involvement, and neurogenic bladder, resulting from neurologic disorders like spinal cord injury that impair detrusor function and produce overflow incontinence.[55][56] Transient PSA elevations can also arise from benign triggers such as recent ejaculation, urinary tract infection (UTI), or digital rectal manipulation, which resolve without intervention.[50] Key differentiators include DRE findings, where prostate cancer often reveals firm, asymmetrical nodules, whereas BPH shows symmetric enlargement and prostatitis elicits tenderness; however, biopsy remains essential for definitive histopathological confirmation, revealing glandular atypia in cancer versus hyperplasia or inflammation in mimics.[36][52]

Screening and diagnosis

Screening methods and guidelines

Screening for prostate cancer in asymptomatic men focuses on early detection to identify potentially aggressive disease while minimizing harms such as unnecessary biopsies and treatment. The primary tools are the prostate-specific antigen (PSA) blood test and the digital rectal examination (DRE). The PSA test measures serum levels of this protein produced by prostate cells, with a general threshold below 4 ng/mL considered normal, though age-adjusted cutoffs are recommended to account for benign increases with age, such as less than 2.5 ng/mL for men aged 40-49 and up to 4.5 ng/mL for those aged 60-69.[57][58] The DRE involves manual palpation of the prostate via the rectum to detect nodules or irregularities, though it has lower sensitivity for early-stage disease compared to PSA and is often used adjunctively.[59][60] Major guidelines emphasize shared decision-making tailored to individual risk and preferences, reflecting evolving evidence on benefits versus harms. Men are recommended to discuss screening, including the prostate-specific antigen (PSA) test and digital rectal examination (DRE), with their healthcare provider starting at ages 45–55, or earlier if high risk (such as men of African ancestry or with a family history of prostate cancer).[61] As of 2025, the U.S. Preventive Services Task Force (USPSTF) recommends that clinicians discuss PSA-based screening with men aged 55-69, weighing a modest mortality reduction against risks like overdiagnosis, but advises against routine screening for men 70 years and older due to minimal benefits and increased harms.[62] The American Urological Association (AUA) guidelines, updated in 2023, suggest initiating screening discussions at age 50 for average-risk men and at age 45 for high-risk groups, including those of African ancestry or with a family history of prostate cancer, with repeat PSA testing every 2-4 years through age 69 and consideration of discontinuation thereafter based on life expectancy and preferences.[63] For high-risk individuals, such as men with a first-degree relative diagnosed before age 65 or those of African ancestry—who face 1.6-2 times higher incidence and mortality rates—earlier and more frequent screening is prioritized to address disparities.[63][6] Advanced strategies aim to refine risk stratification and reduce invasive procedures. Blood-based biomarkers like the 4Kscore (combining total PSA, free PSA, intact PSA, and human kallikrein 2 with clinical factors) and the prostate health index (PHI, incorporating total and free PSA ratios) help predict high-grade cancer, potentially avoiding biopsies in low-risk cases.[64][59] Multiparametric MRI, often used pre-biopsy, identifies suspicious lesions for targeted sampling, with studies showing these approaches collectively reduce unnecessary biopsies by 30-65% while maintaining detection of clinically significant cancers.[65][66] Screening remains controversial due to the risk of overdiagnosis, where 30-50% of screen-detected cancers may be indolent and unlikely to cause harm if untreated, leading to potential overtreatment.[62] Large randomized trials highlight this tension: the Prostate, Lung, Colorectal, and Ovarian (PLCO) Cancer Screening Trial found no significant reduction in prostate cancer mortality with PSA screening after 13 years of follow-up, attributed partly to high contamination rates in the control group.[67] In contrast, the European Randomized Study of Screening for Prostate Cancer (ERSPC) demonstrated a 20-21% relative reduction in prostate cancer deaths after 13-16 years, with extended 2025 analyses confirming sustained benefits and an improving harm-benefit ratio over time.[68][69] These findings underscore the need for personalized screening to balance early detection of lethal cancers against the burdens of indolent ones.

Diagnostic procedures

When prostate cancer is suspected, typically due to an elevated prostate-specific antigen (PSA) level exceeding 4 ng/mL, further diagnostic evaluation is initiated to confirm the presence of malignancy.[70] This threshold, while not absolute and adjusted for factors like age and prostate size, guides the need for imaging and biopsy, as supported by guidelines from the American Urological Association (AUA). Initial imaging often involves multiparametric magnetic resonance imaging (mpMRI), which combines T2-weighted imaging, diffusion-weighted imaging, and dynamic contrast enhancement to assess prostate lesions. mpMRI demonstrates a sensitivity of 85-90% for detecting clinically significant prostate cancer (defined as Gleason score ≥7), allowing for targeted biopsy and reducing the detection of insignificant disease.[71] The cornerstone of confirmatory diagnosis is prostate biopsy, most commonly performed as a transrectal ultrasound-guided (TRUS) systematic biopsy, sampling 10-12 cores from standard zones of the prostate to ensure comprehensive evaluation.[72] To enhance accuracy, MRI-TRUS fusion biopsy integrates mpMRI data with real-time ultrasound, enabling targeted sampling of suspicious lesions and improving the detection rate of high-grade cancers by up to 30% compared to systematic biopsy alone, particularly in men with prior negative results.[72] Transperineal biopsy is an alternative approach, preferred in some centers for lower infection risk, though it requires general anesthesia more often. Pathological examination of biopsy cores determines the cancer grade using the Gleason scoring system, which assigns grades (1-5) to the most prevalent and second-most prevalent architectural patterns observed under microscopy, summing them for a total score ranging from 6 to 10.[73] Higher scores indicate more aggressive disease; for instance, Gleason score 6 represents low-grade cancer with favorable prognosis, while scores of 8-10 signify high-grade tumors. To refine prognostication, the International Society of Urological Pathology (ISUP) introduced five grade groups in 2014: Group 1 (Gleason ≤6), Group 2 (3+4=7), Group 3 (4+3=7), Group 4 (8), and Group 5 (9-10), which better correlate with outcomes than the traditional Gleason system alone.[73] In high-risk cases identified during initial diagnostics (e.g., PSA >20 ng/mL or Gleason ≥8), additional imaging such as bone scintigraphy or prostate-specific membrane antigen positron emission tomography (PSMA-PET) may be employed to evaluate for potential metastatic involvement, though these are primarily for risk stratification rather than initial confirmation.[74] As of 2025, advancements in artificial intelligence (AI) have integrated into prostate cancer diagnosis, enhancing both imaging and pathology analysis. AI models often outperform radiologists in detecting clinically significant prostate cancer on multiparametric MRI, potentially reducing unnecessary biopsies (e.g., by up to 83% for certain lesions while maintaining high negative predictive value). FDA-approved tools like Paige Prostate automate cancer detection and Gleason grading in biopsies with high accuracy (sensitivity >0.94, specificity >0.93). New tools such as PATHOMIQ_PRAD (Mount Sinai, 2024) analyze biopsy slides to predict progression risk in intermediate-risk patients, enabling earlier interventions. ArteraAI's Prostate Biopsy Assay generates risk scores from scanned slides and clinical data to guide treatment choices. Ongoing trials, including the £1.9 million VANGUARD PATH study (2025), test AI for more accurate diagnosis and personalized treatment, potentially sparing men from overtreatment. These tools, validated in multicenter studies, enhance radiologist and pathologist accuracy without replacing human oversight, aligning with updated European Association of Urology (EAU) guidelines emphasizing precision diagnostics.[75][76][77][78][79]

Staging

Staging of prostate cancer involves classifying the extent of the disease to guide treatment decisions and predict prognosis. The primary system used is the American Joint Committee on Cancer (AJCC) Tumor-Node-Metastasis (TNM) staging, which categorizes the tumor based on its size and local invasion (T stage), involvement of regional lymph nodes (N stage), and presence of distant metastasis (M stage).[80] The T stage ranges from T1, indicating a tumor that is neither palpable nor visible on imaging, to T4, where the tumor invades adjacent structures such as the bladder or rectum; for example, T2c denotes a tumor palpable in both prostate lobes but confined within the prostate capsule.[80] N staging distinguishes N0 (no regional lymph node involvement) from N1 (regional lymph node metastasis), while M staging differentiates M0 (no distant metastasis) from M1 (distant metastasis, often to bones or other organs).[81] In addition to TNM, risk stratification systems like those from the National Comprehensive Cancer Network (NCCN) group patients into low, intermediate, high, and very high-risk categories to refine staging and management. These groups are determined by integrating pretreatment prostate-specific antigen (PSA) levels, clinical T stage, and biopsy Gleason score (or Grade Group); for instance, low-risk includes T1-T2a, Gleason ≤6, and PSA <10 ng/mL, while very high-risk may involve T3b-T4 or Gleason 9-10 with higher PSA. Emerging AI-based tools such as the ArteraAI Prostate Test, recommended in the NCCN guidelines, provide additional prognostic and predictive information from digitized biopsy images and clinical data to further refine risk stratification and support personalized staging and management.[82] The Gleason score, derived from biopsy pathology as detailed in diagnostic procedures, plays a key role, with high-grade tumors (Gleason score >7) associated with greater risk of advanced staging and nodal or metastatic involvement.[81] Imaging modalities are essential for accurate TNM staging, particularly in intermediate- to high-risk cases. Computed tomography (CT) or magnetic resonance imaging (MRI) assesses local tumor extent and T staging, while bone scans detect osseous metastases in M staging for patients with higher PSA or Gleason scores.[83] For metastasis evaluation, prostate-specific membrane antigen positron emission tomography (PSMA-PET) offers superior sensitivity (over 90% for detecting lymph node and distant metastases) compared to conventional imaging.[84] As of 2025, PSMA-PET has become the standard for staging high-risk prostate cancer, enhancing accuracy in M staging and potentially altering management in up to 20-30% of cases by identifying occult metastases.[82][84]

Prevention

Lifestyle modifications

Lifestyle modifications may play a role in reducing the risk of developing prostate cancer and slowing its progression in at-risk individuals. Evidence from epidemiological studies indicates that maintaining optimal body weight and avoiding tobacco can improve outcomes. While evidence for specific dietary components and physical activity is variable, recent systematic reviews indicate that plant-based, Mediterranean, and healthy dietary patterns are associated with lower risk of prostate cancer incidence among men without the disease and more consistently with reduced risk of progression and prostate cancer-specific mortality among diagnosed patients, although the evidence is primarily observational with mixed results from randomized trials on biomarkers, and no single intervention offers definitive prevention. These changes may target underlying mechanisms such as inflammation and hormone regulation.[85][86] High dietary intake of dairy products and calcium has been associated with increased prostate cancer risk; meta-analyses show relative risks of 1.11 for high dairy consumption and 1.39 for calcium intake exceeding 1,500 mg per day. Reducing these may be beneficial. For other dietary factors, evidence is inconsistent: some studies link high consumption of red and processed meats to increased risk, but recent meta-analyses show weak or no association. Specific foods like tomatoes (rich in lycopene) and cruciferous vegetables (such as broccoli and cauliflower) show promise in some cohort studies and dose-response analyses; for cruciferous vegetables, higher intake is linked to lower risk, with approximately 15% risk reduction per 50 g/day based on linear extrapolation. Soy products, rich in isoflavones, have been associated with reduced prostate cancer risk in meta-analyses of observational studies, though results are not entirely conclusive and randomized trials are lacking. Additionally, a 2025 meta-analysis of observational studies found that higher plasma or serum selenium levels were associated with reduced prostate cancer risk (RR 0.89, 95% CI 0.83-0.95), suggesting a potential protective effect, though causality is not established.[85][87][88][89] Regular exercise is another potential intervention, with observational data suggesting higher physical activity may reduce incidence by 10-30%, though evidence is modest. There is no evidence that weightlifting or resistance training increases the risk of prostate cancer; observational studies show that resistance training and weight training are either not associated with prostate cancer risk or may be linked to a reduced risk (e.g., non-significant but consistent inverse association for weight training from early adulthood, and a significant inverse dose-response relationship for vigorous-intensity recreational physical activity between ages 19 and 34, with an adjusted odds ratio of 0.67 [95% CI 0.45-1.01] for the highest versus lowest quartile of activity in that age period, p_trend = 0.013). Resistance training constitutes a beneficial form of exercise, and guidelines often recommend incorporating strength or resistance components alongside aerobic activity. Guidelines recommend at least 150 minutes of moderate-intensity activity per week.[90][91][92] Obesity is linked to more aggressive disease and higher mortality; men with BMI >30 kg/m² face approximately 27-34% higher prostate cancer mortality risk compared to those with BMI <25 kg/m², related to inflammation and hormone alterations like elevated insulin-like growth factor-1. Maintaining a BMI below 25 through weight management is advised.[90][91] A prospective cohort study from the Health Professionals Follow-up Study (Harvard) found that men who ejaculated 21 or more times per month had approximately a 20% lower risk of prostate cancer compared to those ejaculating 4-7 times per month. This association suggests a potential protective effect, though causality is not established.[93] Smoking is associated with increased prostate cancer mortality, though evidence for incidence is mixed or shows no increased risk. Quitting smoking improves survival post-diagnosis, with former smokers having lower mortality risk than current smokers; cessation for 10 years or more may align outcomes with never-smokers. Limiting alcohol to fewer than two drinks per day is recommended, as some meta-analyses associate higher consumption with modestly increased prostate cancer risk, though evidence is inconsistent and moderate red wine shows no clear link.[94] For prostate cancer survivors, combined diet and exercise interventions show promising results in improving metabolic health and quality of life. Resistance training is widely recommended as safe and beneficial for prostate cancer patients and survivors, particularly to counteract treatment-related side effects such as muscle loss, fatigue, reduced strength, and diminished physical function, including those associated with androgen deprivation therapy. Some trials demonstrate reductions in recurrence risk, though specific magnitudes vary.[95][96]

Nutrition, diet, and metabolic factors

While evidence for many dietary factors remains inconclusive, research has explored the role of amino acid metabolism in prostate cancer. Prostate cancer cells often reprogram metabolism to support growth, with some studies indicating reliance on specific amino acids. Prostate tumors, particularly in advanced or castration-resistant stages, can switch to using glutamine as a primary fuel source instead of glucose or androgens, supporting energy production, biosynthesis, and redox balance. Inhibiting glutamine metabolism is under investigation as a therapeutic strategy. Observational studies have suggested positive associations between elevated circulating levels of branched-chain amino acids (BCAAs: leucine, isoleucine, valine) and prostate cancer risk, potentially via activation of mTORC1 signaling promoting cell proliferation. For example, meta-analyses report modest odds ratios (e.g., ~1.003 for total BCAAs). In contrast, large prospective cohort studies, such as those in European populations, find no strong evidence associating total protein intake, protein from various sources, or specific amino acid intakes with overall prostate cancer incidence or mortality. Regarding supplements, no amino acid supplement is established as beneficial or safe specifically for prostate cancer prevention or management. Certain supplements (e.g., glutamine, BCAAs, arginine) may theoretically support tumor metabolism and should be approached with caution; consult healthcare providers before use. Whey protein has been noted in older research for potential protective effects via cysteine supporting glutathione in prostate tissue, but evidence is limited. These findings highlight the complex interplay between amino acid availability and cancer metabolism, though dietary protein restriction or specific limitations remain experimental and not recommended without medical supervision.

Chemoprevention

Chemoprevention involves the use of pharmacological agents to reduce the incidence or recurrence of prostate cancer, particularly in high-risk populations such as those with elevated PSA levels or genetic predispositions.[97] These strategies target molecular pathways implicated in carcinogenesis, including androgen signaling and inflammation, though their routine use remains limited due to mixed efficacy, lack of randomized trial confirmation for some, and potential risks.[85] 5-alpha reductase inhibitors (5-ARIs), such as finasteride and dutasteride, inhibit the conversion of testosterone to dihydrotestosterone, thereby reducing prostate epithelial proliferation. The Prostate Cancer Prevention Trial (PCPT), a randomized controlled trial involving over 18,000 men aged 55 and older, demonstrated that daily finasteride (5 mg) reduced the overall incidence of prostate cancer by 24.8% compared to placebo after 7 years of follow-up.[98] Similarly, the Reduction by Dutasteride of Prostate Cancer Events (REDUCE) trial, which enrolled 8,231 men at increased risk (PSA 2.5-10 ng/mL), showed that dutasteride (0.5 mg daily) lowered prostate cancer detection on biopsy by 23% over 4 years.[99] Both trials reported an apparent increase in high-grade (Gleason score 7-10) cancers—18.4% versus 12.2% in the finasteride arm of PCPT—likely due to detection bias from reduced prostate volume and altered PSA levels rather than true increased risk, as long-term survival data show no overall mortality detriment.[100] Despite these findings, 5-ARIs are not routinely recommended for primary prevention in the general population due to the risk-benefit profile, but they may be considered in men with benign prostatic hyperplasia and elevated risk.[101] Observational studies and meta-analyses suggest that nonsteroidal anti-inflammatory drugs (NSAIDs), particularly low-dose aspirin (≤325 mg daily), may be associated with a 7-8% reduction in prostate cancer risk (relative risk 0.92-0.93), with stronger effects for advanced or fatal disease, attributed to inhibition of cyclooxygenase-2 and prostaglandin pathways. However, randomized trial evidence is lacking, and the National Cancer Institute's 2025 summary does not endorse it due to risks like gastrointestinal bleeding.[102][85] Trials of vitamin D supplementation have yielded mixed results, with no clear role in routine prevention. The Vitamin D and Omega-3 Trial (VITAL), a large randomized study of 25,871 men, found that daily vitamin D3 (2,000 IU) did not reduce overall prostate cancer incidence over 5 years (hazard ratio 0.93), though subgroup analyses suggested a potential 17% lower risk of advanced disease in adherent participants.[103] Earlier smaller trials showed modest PSA stabilization but no definitive prevention benefit.[104] Overall, meta-analyses confirm no significant impact on incidence or mortality, and supplementation is not recommended outside deficiency correction.[105] In high-risk individuals with BRCA1/2 mutations, poly (ADP-ribose) polymerase (PARP) inhibitors like olaparib are under evaluation for prevention. Preclinical data and adjuvant trials in other BRCA-associated cancers suggest PARP inhibition may prevent recurrence by exploiting homologous recombination deficiency, with ongoing phase 2 studies exploring neoadjuvant olaparib in high-risk prostate cancer patients prior to prostatectomy.[106] As of 2025, dedicated prevention trials for BRCA carriers remain in early stages, focusing on tolerability and biomarker response rather than established efficacy.[107] Ongoing research in 2025 explores metformin, an antidiabetic agent, for reducing prostate cancer risk in obese men via metabolic modulation (e.g., insulin sensitization and mTOR inhibition). The Metformin Active Surveillance Trial (MAST), a randomized study in low-risk prostate cancer patients, reported no overall delay in progression but highlighted subgroup effects in obese individuals (BMI ≥30 kg/m²), where metformin was linked to higher pathologic progression rates (hazard ratio 2.36), prompting caution.[108] Conversely, observational data suggest potential benefits in high-risk metabolic cohorts, with phase 3 studies underway to assess incidence reduction in prediabetic obese men.[109] No routine recommendation exists pending further evidence.

Management

Treatment of localized disease

Localized prostate cancer, confined to the prostate gland without evidence of metastasis, is typically managed with curative intent through options tailored to the patient's risk stratification, life expectancy, and preferences.[110] Low-risk disease is defined by Gleason score 6 (ISUP Grade Group 1), PSA <10 ng/mL, and clinical stage T1-T2a, while intermediate-risk includes Gleason 7 or higher PSA/stage, and high-risk features Gleason 8-10 or advanced local extension.[111] These treatments aim to eradicate the tumor while minimizing morbidity, with decisions guided by multidisciplinary teams.[112] Active surveillance is the preferred approach for low-risk localized prostate cancer in men with a life expectancy of at least 10 years, allowing many to defer or avoid invasive therapy.[110] It involves serial monitoring with PSA testing every 3-6 months, digital rectal examination annually, multiparametric MRI every 1-2 years, and repeat biopsies every 2-3 years or upon suspicion of progression, excluding cases with cribriform or intraductal histology.[111] Approximately 50% of patients remain treatment-free at 5 years, with prostate cancer-specific mortality under 3% at 15 years, reflecting the indolent nature of low-grade disease.[113] For favorable intermediate-risk prostate cancer (typically Gleason 3+4 with limited pattern 4, PSA 10-20 ng/mL, and other favorable features), active surveillance is a reasonable option in select patients, particularly those with limited life expectancy, comorbidities, or preference to avoid treatment side effects. Observational studies and guideline recommendations indicate that AS provides high cancer-specific survival (often >95% at 10-15 years), similar to definitive treatment (surgery or radiation). However, AS is associated with higher rates of disease progression, upgrading on repeat biopsy, metastasis (low but higher than low-risk, ~1-5% at 10 years in some cohorts), and eventual need for treatment (50-70% at 10 years). No large randomized trial specifically compares AS vs treatment in this exact group, but subgroup data from trials like ProtecT (which included some intermediate-risk cases) show no significant difference in prostate cancer mortality at 15 years across AS, surgery, and radiotherapy arms. Guidelines (NCCN, AUA/ASTRO) list AS as an option for favorable intermediate-risk in appropriately selected patients with close monitoring.[110][114][115] Radical prostatectomy, the surgical removal of the prostate and seminal vesicles, is a standard curative option for localized disease in men with over 10 years' life expectancy, particularly for intermediate- and high-risk cases.[114] Performed via open, laparoscopic, or robotic-assisted approaches, it often includes nerve-sparing techniques to preserve erectile and urinary function when oncologic safety permits.[110] For high-risk disease, extended pelvic lymph node dissection is recommended if nodal involvement risk exceeds 5%.[112] Long-term outcomes show 15-year prostate cancer-specific survival exceeding 97% in low- to intermediate-risk cohorts, with biochemical recurrence-free survival around 80-90% at 10 years.[115] Radiation therapy offers a non-surgical curative alternative for localized prostate cancer across risk groups, delivered as external beam radiation therapy (EBRT), brachytherapy, or stereotactic body radiation therapy (SBRT).[111] EBRT, using intensity-modulated techniques with image guidance, delivers 74-80 Gy over 37-40 fractions for low-risk disease, while brachytherapy—low-dose-rate seeds or high-dose-rate temporary implants—serves as monotherapy for low- to favorable intermediate-risk cases with good baseline urinary function.[110] SBRT, a form of ultra-hypofractionation, targets focal disease with 35-40 Gy in 5 fractions, achieving 5-year freedom from failure rates near 95%.[112] For intermediate- and high-risk disease, radiation is combined with androgen deprivation therapy (ADT) for 4-6 months or 2-3 years, respectively, improving biochemical control.[114] Focal therapy targets only the index tumor in select low- to intermediate-risk localized prostate cancer, sparing healthy tissue to reduce side effects, though it remains investigational and recommended only in clinical trials or registries.[110] High-intensity focused ultrasound (HIFU) uses transrectal or transurethral probes to ablate unifocal lesions via thermal coagulation, while cryotherapy freezes tissue with ultrasound-guided probes inserted transperineally.[112] Both require strict MRI-guided patient selection and post-treatment surveillance with PSA, MRI, and biopsy, showing 5-10 year locoregional control rates of 80-90% in eligible cases.[116] By 2025, moderate hypofractionated EBRT (e.g., 60 Gy in 20 fractions) has become a standard regimen for localized prostate cancer, equivalent in efficacy to conventional fractionation while reducing treatment sessions and improving patient convenience, supported by phase III trials like HYPO-RT-PC and PACE-B.[117] Ultra-hypofractionation, including SBRT, is now routinely offered for low- to intermediate-risk disease.[110] Artificial intelligence enhances radiation planning through automated contouring, dose optimization, and adaptive replanning, reducing planning time by up to 50% and improving target coverage precision in prostate cases.[118]

Treatment of advanced and metastatic disease

Advanced prostate cancer includes locally advanced disease (T3-T4 or N1 without distant metastasis), high-risk biochemically recurrent (BCR) disease, and non-metastatic castration-resistant prostate cancer (nmCRPC), in addition to metastatic stages. For locally advanced disease, external beam radiation therapy combined with long-term androgen deprivation therapy (ADT; 2-3 years) is a standard approach, offering improved survival over radiation alone.[119] In nmCRPC and high-risk BCR (PSA doubling time ≤10 months), second-generation androgen receptor pathway inhibitors such as enzalutamide, apalutamide, or darolutamide are recommended to delay metastasis, based on trials like PROSPER, SPARTAN, and ARAMIS showing metastasis-free survival benefits of 20-30 months.[120] As of October 2025, final EMBARK trial data demonstrated that adding enzalutamide to ADT in high-risk BCR reduces the risk of death by 40% (hazard ratio 0.60) compared to ADT alone, with 8-year survival of 79% versus 70%.[121] Treatment of advanced and metastatic prostate cancer primarily involves systemic therapies aimed at controlling disease progression, alleviating symptoms, and extending survival, as curative options are limited once the cancer has spread beyond the prostate. Androgen deprivation therapy (ADT) forms the backbone of initial management for metastatic hormone-sensitive prostate cancer (mHSPC), achieved through medical options such as luteinizing hormone-releasing hormone (LHRH) agonists (e.g., leuprolide) or antagonists (e.g., degarelix), or surgical orchiectomy, which suppress testosterone production to inhibit cancer growth.[120] In mHSPC, ADT is often combined with novel hormonal agents like abiraterone acetate (an androgen biosynthesis inhibitor) or enzalutamide (an androgen receptor inhibitor) to enhance outcomes, based on trials such as CHAARTED and STAMPEDE showing improved overall survival (OS) with these additions. For patients progressing to metastatic castration-resistant prostate cancer (mCRPC) despite ADT, second-generation agents like abiraterone (with prednisone) and enzalutamide are standard first-line options in the post-chemotherapy or chemotherapy-naïve setting, with evidence from the COU-AA-301 and AFFIRM trials demonstrating OS benefits of 4.6 months and 4.8 months, respectively. Oral therapies, including androgen receptor pathway inhibitors (ARPIs) such as abiraterone acetate, enzalutamide, apalutamide, and darolutamide, as well as the oral GnRH antagonist relugolix, are key components of systemic treatment for advanced and metastatic prostate cancer. These medications are prescribed by specialists, primarily urologists (including urologic oncologists) and medical oncologists. In multidisciplinary settings, treatment decisions often involve collaboration among urologic oncologists, medical oncologists, and radiation oncologists. Urologists have increasingly taken a leading role in prescribing these oral targeted therapies for advanced prostate cancer, facilitated by their oral administration, which allows for in-office dispensing in some urology practices. Studies have shown that the adoption of in-office dispensing by urology practices is associated with increased prescription fills for agents like abiraterone and enzalutamide. [122] For example, practices adopting dispensing saw higher rates of new prescription fills compared to non-dispensing practices, with difference-in-difference estimates indicating improved access and use among men with advanced disease. This shift has enabled urologists to manage more patients with advanced prostate cancer within their practices, potentially improving treatment adherence and continuity of care. Pharmacists also play a supportive role in multidisciplinary teams by managing drug interactions, dosing, and adherence for oral regimens. Chemotherapy plays a key role in both mHSPC and mCRPC. In mHSPC, docetaxel combined with ADT is a first-line standard, particularly for high-volume disease, as the CHAARTED trial reported a 17-month median OS versus 13.6 months with ADT alone. For mCRPC after docetaxel failure, cabazitaxel (with prednisone) is the preferred second-line agent, with the TROPIC trial showing a 2.4-month OS improvement (15.1 months versus 12.7 months). According to the NCCN Prostate Cancer Guidelines Version 5.2026, cabazitaxel plus carboplatin (with G-CSF support) is recommended as a treatment option for fit patients with aggressive-variant metastatic castration-resistant prostate cancer (mCRPC), including cases with neuroendocrine features or poor-risk characteristics, particularly where standard options like docetaxel may not be suitable. This aligns with earlier guidance in patient versions based on Version 2.2025.[119] Triplet therapy—ADT plus docetaxel and darolutamide (another androgen receptor inhibitor)—has emerged as a superior option for mHSPC, with the ARASENS trial demonstrating a 32.5% reduction in death risk (hazard ratio 0.68), translating to about 30% improved survival compared to ADT plus docetaxel alone.[123] Targeted therapies are increasingly important for specific molecular subtypes. Prostate-specific membrane antigen (PSMA)-targeted radioligand therapy with lutetium-177-PSMA-617 (Pluvicto) is approved for PSMA-positive mCRPC after androgen receptor pathway inhibitor and taxane failure, with the VISION trial showing a 38% reduction in progression or death risk. In March 2025, the FDA expanded approval to earlier use in mCRPC following only an androgen receptor pathway inhibitor, enabling broader access and allowing delay of chemotherapy based on the PSMAfore trial, which showed a median radiographic progression-free survival of 11.6 months versus 5.6 months in an updated exploratory analysis.[124] PARP inhibitors, such as olaparib, are recommended for mCRPC with BRCA1/2 or other homologous recombination repair mutations, as the PROFOUND trial reported a 5.8-month radiographic progression-free survival advantage and improved OS in this subgroup.[125] In December 2025, the FDA approved niraparib in combination with abiraterone acetate and prednisone (Akeega) for patients with BRCA2-mutated metastatic castration-sensitive prostate cancer, based on the AMPLITUDE trial demonstrating a significant improvement in radiographic progression-free survival (hazard ratio 0.46) in the BRCA2 subgroup.[126] In the same month, the FDA granted regular approval to rucaparib for adults with BRCA-mutated metastatic castration-resistant prostate cancer who have progressed after androgen receptor-directed therapy, based on the TRITON3 trial showing a median radiographic progression-free survival of 11.2 months versus 6.4 months (hazard ratio 0.50).[127] Immunotherapy has limited but targeted utility in advanced disease. Pembrolizumab, a PD-1 inhibitor, is approved for mCRPC with microsatellite instability-high (MSI-H) or mismatch repair deficiency, where it yields objective response rates of up to 50% in small cohorts, as evidenced by KEYNOTE-199 and real-world data. Overall, treatment selection is guided by performance status, disease volume, genomic profiling, and prior therapies, with ongoing trials exploring combinations to further optimize sequencing.[82]

Supportive and palliative care

Supportive and palliative care in prostate cancer focuses on managing symptoms, alleviating treatment-related side effects, and enhancing quality of life across all disease stages, with early integration recommended to optimize outcomes.[128] This approach encompasses physical, emotional, and social support, tailored to individual needs, and is provided by multidisciplinary teams including oncologists, urologists, nurses, and palliative specialists.[128] Urinary incontinence, a common issue following prostatectomy, affects up to 10-20% of patients long-term and can be managed initially with pelvic floor exercises; for persistent moderate to severe cases, male slings provide effective support by compressing the urethra, achieving continence in approximately 50-80% of suitable patients, while artificial urinary sphincters offer a mechanical cuff for more severe incontinence, with success rates of 80-90% but higher revision needs.[129][130] Sexual dysfunction, particularly erectile dysfunction (ED) from surgery or androgen deprivation therapy (ADT), impacts over 50% of patients and is addressed with phosphodiesterase type 5 (PDE5) inhibitors such as sildenafil or tadalafil as first-line therapy, improving erectile function in 40-70% of post-prostatectomy cases without increasing cancer recurrence risk.[131][132] For refractory ED, penile implants or vacuum devices may be considered.[128] Pain from bone metastases, occurring in up to 80% of advanced cases, is a primary concern, with palliative external beam radiation therapy providing rapid relief in 60-80% of patients using a single 8 Gy fraction as effectively as multi-fraction regimens.[133][134] Bone health is supported by denosumab or bisphosphonates like zoledronic acid to prevent skeletal-related events such as fractures, reducing incidence by 17-23% compared to placebo in men on ADT, alongside calcium and vitamin D supplementation to mitigate osteoporosis risk.[135][136] Psychological distress is prevalent, with depression affecting 15-20% and anxiety up to 33% of prostate cancer patients, often linked to diagnosis and treatment impacts; counseling, including cognitive behavioral therapy, and support groups significantly reduce these symptoms and improve coping, with peer-led groups enhancing quality of life through shared experiences.[137][138][139] Multidisciplinary care integrates nutrition counseling to combat cachexia and weight loss in advanced disease, rehabilitation, including resistance training, for physical function restoration post-treatment—with resistance training widely recommended as safe and beneficial for prostate cancer patients to counter treatment side effects such as muscle loss and fatigue from androgen deprivation therapy or other treatments, and to improve quality of life, metabolic health, and potentially reduce recurrence risk—and hospice services for end-of-life symptom control and family support in terminal stages.[140][141][128][142] As of 2025, telehealth platforms enable remote symptom monitoring and palliative consultations, improving access for rural patients and demonstrating feasibility in reducing pain and enhancing quality of life.[143] Cannabis derivatives, such as THC:CBD oils, show promise for refractory cancer-related pain, with studies indicating symptom burden reduction in advanced cases when used adjunctively.[144][145]

Prognosis

Survival rates

In the United States, the 5-year relative survival rate for prostate cancer is 98%, reflecting the high proportion of cases diagnosed at early stages.[16] The 15-year relative survival rate reaches 97% for cases detected early, largely due to the 83% of diagnoses occurring at a localized stage.[16] Survival rates vary significantly by stage at diagnosis, according to data from the Surveillance, Epidemiology, and End Results (SEER) program. For localized disease, the 5-year relative survival rate is nearly 100%, while it remains at nearly 100% for regional spread; however, for distant metastatic disease, it drops to 37%.[11] These stage-specific outcomes underscore the benefits of screening, which has contributed to earlier detection and improved overall survival.[15] Prostate cancer mortality in the United States has declined by more than 50% since the 1990s, attributed in part to widespread prostate-specific antigen (PSA) testing enabling earlier interventions.[16] Incidence rates, after a decline from 2007 to 2014, have shown a 3% annual increase since 2014, driven by rising regional- and distant-stage diagnoses.[16] Globally, 5-year survival rates for prostate cancer are markedly lower in low-resource settings due to limited screening and late-stage presentations. For example, in sub-Saharan Africa, overall 5-year survival is approximately 40-50%, compared to over 90% in high-income regions.[146] For metastatic castration-resistant prostate cancer (mCRPC), median overall survival has improved to 3-5 years with contemporary therapies, including novel androgen receptor pathway inhibitors and combination regimens, up from around 2 years in earlier eras.[147][148]

Factors influencing prognosis

The prognosis of prostate cancer is influenced by a range of tumor, patient, pathological, and treatment response factors, which help predict disease progression and response to therapy.[149] Among tumor characteristics, the Gleason score is a primary determinant, with scores greater than 8 indicating aggressive disease and poorer outcomes, particularly in organ-confined cases.[149] Some studies have associated higher serum triiodothyronine (T3) levels with increased prostate cancer aggressiveness, including higher Gleason scores, Grade Groups, and tumor stage. A 2020 prospective study of 125 patients found significantly higher serum T3 levels in those with Grade Group 3-5 versus Grade Group 1-2 (p=0.047), with positive correlations to Gleason score (Spearman's ρ=0.188, p=0.036) and pathological tumor stage (ρ=0.178, p=0.047).[150] An earlier 2001 study linked higher serum T3 levels to higher risk categories incorporating Gleason score and stage (p=0.011).[151] Elevated pretreatment prostate-specific antigen (PSA) levels, such as greater than 20 ng/mL, are associated with advanced disease and reduced survival in localized prostate cancer.[149] Positive surgical margins after prostatectomy further worsen prognosis by increasing the risk of recurrence, especially when combined with high Gleason scores or extracapsular extension.[149] Patient-related factors also play a critical role; advanced age is linked to shorter survival, with those aged 80 years or older experiencing substantially reduced median survival compared to younger patients.[152] Comorbidities, particularly cardiovascular disease, independently predict poorer overall survival, as they elevate mortality risk beyond cancer-specific progression.[153] Similarly, diminished performance status, as measured by the Eastern Cooperative Oncology Group (ECOG) score, correlates with worse outcomes following treatments like radiotherapy.[153] Pathological features such as lymphovascular invasion signify a higher likelihood of metastatic spread and biochemical recurrence, serving as an independent adverse prognostic indicator.[154] Seminal vesicle involvement, especially when bilateral, is associated with more aggressive histopathologic traits and elevated risk of disease progression compared to unilateral invasion.[155] Treatment response markers, including early achievement of a low PSA nadir following androgen deprivation therapy (ADT), predict better long-term control, with levels below 0.2 ng/mL linked to extended survival in metastatic settings.[156] In contemporary practice as of 2025, genomic classifiers like the Decipher score enhance risk stratification by assessing RNA expression profiles to forecast biochemical recurrence and metastasis, demonstrating significant hazard ratios (up to 2.58 for high- versus low-risk groups) in real-world cohorts.[157]

Special populations

Prostate cancer in different ethnic groups

Prostate cancer exhibits significant disparities across ethnic and racial groups, influenced by a combination of genetic, socioeconomic, environmental, and access-related factors. These differences manifest in varying incidence rates, tumor aggressiveness, stage at diagnosis, and mortality outcomes, with non-Hispanic White men often serving as a reference point in U.S.-based studies. Globally, such disparities underscore the need for tailored screening and treatment approaches to address inequities in disease burden. Among men of African or Black ancestry, prostate cancer incidence is approximately 1.7 times higher and mortality about 2.1 times higher compared to non-Hispanic White men, based on historical U.S. data through 2020; as of 2025, disparities persist with incidence ~1.7 times higher and mortality ~2 times higher.[158] These tumors tend to be more aggressive, with higher Gleason scores indicating greater malignancy, and Black men are often diagnosed at later stages due to barriers in screening access and healthcare utilization.[159] In contrast, men of Asian ancestry experience roughly half the prostate cancer incidence risk of non-Hispanic White men, particularly in native Asian populations, though rates are rising among Westernized Asian Americans due to lifestyle changes such as diet and reduced physical activity.[159] Despite the lower overall risk, when diagnosed, Asian men generally have better prognosis and survival outcomes, attributed to earlier detection and less aggressive disease biology in many cases.[160] Hispanic or Latino men face an intermediate risk profile, with incidence rates about 9% lower than non-Hispanic White men but higher than in many native Latin American populations.[161] Within the U.S., successive generations of Latino men show a generational increase in aggressive prostate cancer forms, linked to acculturation, dietary shifts, and greater exposure to environmental risk factors.[162] Indigenous populations, including American Indians, Alaska Natives, and Aboriginal groups, experience lower prostate cancer incidence but disproportionately high mortality rates (e.g., ~31% higher than non-Indigenous Whites), primarily due to systemic barriers in healthcare access such as geographic isolation, limited screening programs, and cultural mistrust of medical systems.[163][164]

Prostate cancer in younger men

Prostate cancer is exceedingly rare in men under the age of 50, comprising less than 1% of all diagnosed cases, with the risk estimated at approximately 0.2% before age 50 and rising sharply thereafter.[16] In this age group, the disease often presents with more aggressive features, including higher Gleason scores and a greater likelihood of metastasis at diagnosis compared to older patients.[165] These characteristics contribute to poorer prognoses when high-grade or advanced disease is identified, underscoring the need for heightened clinical vigilance in younger individuals. As of 2025, distant-stage prostate cancer incidence has been increasing by approximately 2.6% annually in men under 55.[16] Risk factors for prostate cancer in younger men emphasize a strong genetic component, with mutations in genes such as BRCA1, BRCA2, and those associated with Lynch syndrome (mismatch repair genes like MSH2 and MLH1) conferring elevated susceptibility, often leading to earlier onset and more aggressive forms.[166] Family history is more common in this demographic, with inherited mutations accounting for a notable portion (e.g., up to 12% overall, higher in early-onset), significantly amplifying risk compared to sporadic occurrences in older populations.[159] In terms of clinical presentation, prostate cancer in men under 50 is frequently symptomatic at diagnosis, manifesting as lower urinary tract symptoms, hematuria, or pelvic pain, rather than being detected incidentally through screening, due to the absence of routine guidelines for this age group.[167] The disease often exhibits rapid progression, with tumors advancing to locally invasive or metastatic stages more quickly than in older men, necessitating prompt intervention.[165] Management of prostate cancer in younger men prioritizes aggressive curative approaches, such as radical prostatectomy or radiation therapy, over active surveillance, given the higher risk of progression and the potential for long-term survival benefits in this cohort.[165] Fertility preservation is a critical consideration, with sperm cryopreservation recommended prior to treatment to mitigate the gonadotoxic effects of surgery, radiotherapy, or androgen deprivation therapy.[168] Incidence rates among younger cohorts have shown an approximate 10% rise over the past decade, potentially linked to environmental exposures such as pollution and obesity, alongside established genetic risks.[169] Genomic profiling has become a standard component of evaluation in this population, enabling identification of actionable mutations like BRCA alterations to guide personalized therapy.[170]

History

Early discoveries

The earliest documented references to conditions that may have involved prostate pathology date back to ancient Egypt. The Ebers Papyrus, an ancient medical text from approximately 1550 BCE, describes symptoms of urinary obstruction and retention, which could indicate prostate enlargement or related disorders obstructing urine flow, though not explicitly identified as cancer.[171] Similarly, the Edwin Smith Papyrus, dating to around 1600 BCE, mentions tumors and surgical interventions for swellings, providing early evidence of medical recognition of abnormal growths in the pelvic region, potentially including prostate issues.[172] In ancient Greece, Hippocrates (c. 460–370 BCE), often called the Father of Medicine, provided some of the first clinical observations linking urinary difficulties to age-related changes in the male reproductive system. He described urinary retention and hesitancy in elderly men, attributing these to imbalances in bodily humors and noting that diseases of the kidneys and bladder were harder to treat in old age, implying an association with prostatic hardening or enlargement.[173] These accounts laid foundational observations for later understandings of prostate-related ailments, though cancer was not distinguished as a specific entity until much later. During the 19th century, advances in microscopy and pathology enabled the first clear identifications of prostate cancer. In 1853, surgeon John Adams at The London Hospital reported the initial histological description of prostate cancer during an autopsy, characterizing it as a rare "scirrhous" (hardened) condition involving malignant infiltration of the gland, often presenting with urinary obstruction.[174] Around the same period, Scottish surgeon William Fergusson (1808–1877) contributed to the understanding of prostate diseases by emphasizing their prevalence in older men through his surgical experiences and writings on urinary tract pathologies in the 1850s, reinforcing the age-related link observed by earlier physicians.[175] In the early 20th century, surgical innovations marked significant progress in managing localized prostate cancer. In 1904, American urologist Hugh Hampton Young performed the first radical perineal prostatectomy specifically for prostate cancer at Johns Hopkins Hospital, removing the entire gland and surrounding tissues to achieve potential cure, a procedure he refined and detailed in subsequent publications.[176] By the 1930s, exploratory trials of hormonal interventions began, with researchers investigating estrogen administration to suppress prostate growth, setting the stage for later therapies. These efforts culminated in the seminal 1941 work by Charles Huggins and Clarence Hodges, who demonstrated that prostate cancer growth is hormone-dependent, particularly on androgens; Huggins received the Nobel Prize in Physiology or Medicine in 1966 for this discovery.[174]

Advances in treatment and detection

The discovery of prostate-specific antigen (PSA) in 1971 marked a pivotal advancement in prostate cancer detection, as researchers identified it as a protein produced by prostate cells, initially in seminal fluid.[177] By 1980, a reliable blood assay for PSA had been developed, allowing for non-invasive measurement and enabling widespread early detection of prostate abnormalities.[178] This assay revolutionized screening, with studies in the early 1990s demonstrating its utility in identifying prostate cancer before symptoms manifest, leading to earlier interventions and improved outcomes.[179] In the 1990s, further refinements in PSA utilization included the introduction of prostate-specific antigen doubling time (PSADT), a metric that quantifies the rate of PSA increase over time to monitor disease progression in patients with rising levels post-treatment.[180] PSADT helped clinicians distinguish between benign fluctuations and aggressive cancer recurrence, guiding decisions on salvage therapies. Concurrently, brachytherapy experienced a revival through transperineal implantation techniques and improved imaging, offering a precise, minimally invasive radiation option for localized disease with outcomes comparable to surgery.[181] The 2000s brought surgical innovations, notably the first robot-assisted radical prostatectomy in 2000, which enhanced precision via three-dimensional visualization and articulated instruments, reducing blood loss and recovery time compared to open procedures.[182] Androgen deprivation therapy (ADT) also saw refinements, including intermittent dosing schedules and the adoption of gonadotropin-releasing hormone antagonists, which minimized side effects like cardiovascular risks while maintaining efficacy in hormone-sensitive advanced disease.[183] By the 2010s, targeted therapies transformed management of metastatic castration-resistant prostate cancer (mCRPC). Abiraterone acetate, approved by the FDA in 2011, inhibits androgen synthesis upstream of the receptor, extending survival when combined with prednisone. Enzalutamide, approved in 2012, blocks androgen receptor signaling, delaying progression and improving quality of life in post-chemotherapy patients. Detection advanced with prostate-specific membrane antigen (PSMA) positron emission tomography (PET) imaging, emerging in the mid-2010s, which offers superior sensitivity for identifying metastases compared to conventional scans.[184] In 2022, lutetium-177-PSMA-617 (Pluvicto) received FDA approval as the first targeted radioligand therapy for PSMA-positive mCRPC, delivering beta radiation directly to cancer cells and improving overall survival based on the VISION trial.[185] This approval was expanded in 2025 to include earlier use after androgen receptor pathway inhibitor therapy, broadening access for progressive disease. These cumulative advances have contributed to a approximately 50% decline in prostate cancer mortality rates since the early 1990s, attributed to enhanced early detection and more effective systemic treatments.[158]

Society and culture

Public awareness and campaigns

Public awareness campaigns for prostate cancer have played a pivotal role in educating the public, encouraging early screening, and addressing cultural barriers to men's health discussions. One of the most prominent global initiatives is Movember, launched in 2003 in Australia, which encourages participants to grow mustaches during November to spark conversations about men's health issues, including prostate cancer. Since its inception, Movember has raised over $1 billion worldwide, funding more than 1,320 projects across 20 countries focused on awareness, research, and improved outcomes for prostate cancer patients.[186] The campaign's emphasis on community engagement has helped normalize discussions around prostate health, particularly in regions where stigma persists. In 2025, Movember invested an additional $4.9 million in 18 grants to address health inequities in prostate cancer care. In the United States, the Prostate Cancer Foundation (PCF) leads awareness efforts through annual Prostate Cancer Awareness Month in September, providing toolkits, educational resources, and calls for screening to empower men and families. The Centers for Disease Control and Prevention (CDC) further promotes screening by offering free guides, videos, and factsheets that highlight the importance of early detection for high-risk cancers, aiming to identify aggressive cases before they spread. Additionally, former President Joe Biden's May 2025 diagnosis with aggressive prostate cancer, which included metastasis to the bone, generated significant media coverage and bipartisan support, boosting public visibility and encouraging more men to consider screening discussions with their healthcare providers. His October 2025 update on undergoing radiation therapy further amplified these conversations.[187][60][188] Stigma surrounding prostate cancer, often tied to men's health taboos and embarrassment over symptoms or screening methods like the digital rectal exam, contributes to lower screening rates in certain demographics, such as Black men who face disproportionately higher incidence but delayed diagnoses. Media portrayals and celebrity endorsements, including Biden's public journey, have helped normalize these conversations by reducing shame and promoting proactive health behaviors. Globally, organizations aligned with World Health Organization (WHO) goals for cancer equity advocate for targeted education to bridge disparities, while digital tools like the Prostate Cancer Genius App deliver personalized information on risks and screening to improve knowledge and uptake among underserved populations.[189][190][191] These efforts have demonstrated measurable impact, with campaigns like the UK's NHS prostate cancer awareness drive leading to a 23% increase in urological cancer referrals shortly after launch, linking heightened awareness to improved screening participation. Overall, such initiatives have been associated with up to a 20-25% rise in screening uptake in targeted communities, underscoring their role in reducing late-stage diagnoses.[192]

Socioeconomic impacts

Prostate cancer imposes a significant economic burden on healthcare systems and individuals in the United States, with direct medical costs for treatment and management exceeding $12 billion annually in recent estimates. Per-patient treatment costs vary widely depending on disease stage and modality, ranging from approximately $28,000 for early-stage care to $74,000 for advanced or end-of-life care, encompassing surgery, radiation, hormone therapy, and chemotherapy. These expenses often lead to substantial out-of-pocket costs for patients, with averages of approximately $3,000–$5,000 in the first year for early-stage disease, rising for advanced cases depending on insurance coverage.[193] Socioeconomic disparities amplify the impact, as individuals in low-income and rural areas experience higher mortality rates—up to 20% elevated in rural settings and 1.5 times higher in high-deprivation neighborhoods—primarily due to delayed diagnosis and limited access to timely care. Policy interventions like the Affordable Care Act (ACA) have improved coverage for preventive services and essential health benefits, including cancer screenings and treatments, facilitating earlier diagnosis and reducing mortality among previously uninsured men with prostate cancer. Additionally, value-based care models, such as accountable care organizations with strong urologist involvement, have been associated with lower rates of overtreatment and reduced spending on low-risk cases by promoting active surveillance over aggressive interventions. Globally, low- and middle-income countries (LMICs) bear a disproportionate burden, with prostate cancer mortality rates rising due to limited access to prostate-specific antigen (PSA) testing and radiotherapy, resulting in outcomes up to twice as poor as in high-income countries where early detection and treatment are more available. In LMICs, shortages of specialized equipment and personnel contribute to advanced-stage presentations at diagnosis, driving an 85% projected increase in annual deaths by 2040. The disease also affects workforce productivity, with prostate cancer survivors 10 percentage points less likely to be employed six months post-diagnosis compared to controls, leading to substantial indirect costs from lost wages and reduced labor participation. Caregivers, often spouses or family members, face significant burden, reporting up to 20% overall work productivity loss from time spent on patient support, which can equate to nearly full-time responsibilities in cases of metastatic disease.

Research

Current clinical trials

As of November 2025, approximately 650 clinical trials investigating prostate cancer interventions are actively recruiting or enrolling participants on ClinicalTrials.gov, with a notable emphasis on optimizing treatments for metastatic and oligometastatic disease stages.[194] These studies prioritize combinations of established therapies with emerging agents to improve outcomes in hormone-sensitive and castration-resistant settings. In phase III trials, neoadjuvant approaches combining immunotherapy with androgen deprivation therapy (ADT) are under evaluation to enhance surgical outcomes in high-risk localized disease. Extensions of triplet therapy, which integrates ADT, androgen receptor pathway inhibitors (ARPIs), and chemotherapy, are being tested with radioligand additions; the PSMAddition trial (NCT04720157) examines [177Lu]Lu-PSMA-617 combined with ADT and ARPI in PSMA-positive mHSPC, demonstrating delayed progression to castration-resistant disease in early analyses.[195] Biomarker-driven trials target subgroups with suboptimal responses to standard PSMA-targeted therapies, such as those with PSMA-low expression; the phase II VALOR trial (NCT06145633) investigates vorinostat to upregulate PSMA prior to [177Lu]Lu-PSMA-617 in metastatic castration-resistant prostate cancer (mCRPC), aiming to expand eligibility.[196] Artificial intelligence integration in active surveillance protocols is also advancing, as seen in the AI-Assisted Risk-based Prostate Cancer Screening study (NCT05443412), which uses AI algorithms on urine and blood biomarkers to refine risk stratification and reduce unnecessary biopsies, and the VANGUARD PATH study (initiated in 2025), which tests the ArteraAI Prostate Biopsy Assay to improve diagnostic accuracy, personalize treatment decisions, and potentially reduce overtreatment.[197][79] Efforts to address equity include targeted enrollment of underrepresented populations, particularly men of African ancestry, who face higher incidence and mortality rates; trials like the RESPOND study incorporate genomics from African descent cohorts to tailor interventions and improve representation, with over 20% enrollment from these groups in select protocols.[198] Common endpoints across these trials emphasize progression-free survival (PFS) as a primary measure of efficacy, alongside quality-of-life metrics assessed via tools like the Functional Assessment of Cancer Therapy-Prostate (FACT-P) scale to evaluate patient-reported symptoms and treatment tolerability.[199] A key 2025 focus is oligometastatic disease management, exemplified by the PSMA-DC trial (NCT05939414), which tests [177Lu]Lu-PSMA-617 in low-volume metastatic cases to assess metastasis-free survival and defer systemic therapy intensification.[200] Ongoing research also includes trials targeting resistance mechanisms in advanced disease. The phase II SYNERGY-201 trial (NCT06228053) evaluates SX-682, a CXCR1/2 inhibitor, combined with enzalutamide in men with androgen receptor pathway inhibitor (ARPI)-resistant metastatic castration-resistant prostate cancer (mCRPC). Sponsored by Syntrix Biosystems, the study aims to achieve clinical benefit by overcoming hormone therapy resistance through modulation of the tumor microenvironment, with the last update in December 2025 confirming continued recruitment.[201]

Emerging therapies and technologies

Precision medicine approaches are advancing the management of prostate cancer through non-invasive monitoring and targeted genetic interventions. Liquid biopsies, which analyze circulating tumor DNA (ctDNA) in blood, enable real-time assessment of disease burden, treatment response, and resistance mechanisms in prostate cancer patients.[202] These biopsies provide a minimally invasive alternative to tissue sampling, with ctDNA detection showing promise for early detection and prognostication, particularly in advanced cases where tumor evolution can be tracked longitudinally.[203] Complementing this, CRISPR/Cas9 gene editing has emerged as a tool for targeting the androgen receptor (AR), a key driver in prostate cancer progression. Recent genome-scale CRISPR screens have identified modulators like PTGES3 that directly influence AR function, suggesting potential for disrupting AR signaling in castration-resistant disease.[204] By editing AR genes, CRISPR strategies could reverse resistance to hormonal therapies, enhancing efficacy in preclinical models of advanced prostate cancer.[205] Novel therapeutic agents are expanding beyond established prostate-specific membrane antigen (PSMA) targeting to address unmet needs in metastatic disease. Radioligands directed at alternative targets, such as novel PSMA variants or other tumor-associated antigens, are under investigation to improve specificity and reduce off-target effects. For instance, next-generation PSMA radioligands like 177Lu rhPSMA-10.1 demonstrate high tumor uptake with minimal healthy tissue exposure in phase 1/2 trials for metastatic castration-resistant prostate cancer (mCRPC).[206] These agents, often using alpha emitters or combination approaches, aim to enhance response rates in PSMA-low or heterogeneous tumors.[207] Similarly, bispecific antibodies, such as T-cell engagers targeting KLK2 and CD3, are showing early antitumor activity by redirecting T cells to prostate cancer cells. Pasritamig, a first-in-class bispecific antibody, exhibited promising efficacy and tolerability in first-in-human studies for mCRPC, with ongoing trials exploring its role in combination regimens.[208] Ongoing advancements in PSMA-targeted radioligand therapies include comparisons of lutetium-177 and actinium-225 variants in trials such as ANDROMEDA for oligorecurrent disease, combining with SBRT.[209] Other candidates in late-stage development include 177Lu-PNT2002 in the SPLASH trial and TLX591 in the ProstACT GLOBAL study.[210][211] In immunotherapy, T-cell engagers like VIR-5500 demonstrated PSA declines of ≥50% in 82% of patients at the highest dose in phase 1 trials for advanced metastatic castration-resistant prostate cancer (mCRPC).[212] Technological innovations are enhancing diagnostic precision and therapeutic delivery in prostate cancer care. Artificial intelligence (AI) algorithms applied to pathology slides achieve high accuracy in Gleason scoring, with recent models reporting up to 95-96% specificity and sensitivity for cancer detection and grading.[213] These AI tools, validated in clinical settings, assist pathologists by identifying Gleason patterns and reducing inter-observer variability, thereby improving risk stratification for localized disease.[214] FDA-approved tools such as Paige Prostate automate cancer detection and Gleason grading in prostate needle biopsies, improving diagnostic accuracy by reducing detection errors and enhancing pathologist sensitivity and specificity across varying experience levels. Other recent developments include PATHOMIQ_PRAD (developed at Mount Sinai in 2024), which analyzes biopsy slides using deep learning to predict progression risk in intermediate-risk patients, and ArteraAI's Prostate Biopsy Assay, which integrates scanned slides with clinical data to generate risk scores predicting therapy benefit and long-term outcomes to guide personalized treatment. AI applications also extend to multiparametric MRI, where models assist in detecting clinically significant prostate cancer, often outperforming or augmenting radiologists and reducing unnecessary biopsies by approximately 20% in hybrid approaches while preserving high sensitivity for aggressive disease.[76][215][216] In parallel, nanotherapy platforms are optimizing drug delivery to tumor sites, leveraging nanoparticles to enhance bioavailability and target prostate cancer cells selectively. Liposomal and dendrimer-based nanocarriers, for example, improve the uptake of chemotherapeutic or immunotherapeutic agents while minimizing systemic toxicity, as demonstrated in preclinical studies reshaping the tumor microenvironment.[217] Vaccine-based immunotherapies are evolving from earlier platforms like PROSTVAC, which targeted prostate-specific antigen (PSA) but faced challenges in phase III trials, toward next-generation constructs with enhanced immunogenicity. Successor approaches incorporate modified viral vectors or mRNA technologies to stimulate broader T-cell responses against multiple tumor antigens, building on PROSTVAC's poxvirus foundation to overcome immune tolerance in advanced prostate cancer.[218] Chimeric antigen receptor T-cell (CAR-T) therapy, adapted for solid tumors like prostate cancer, is addressing immunosuppressive barriers through engineered T cells targeting PSMA or other surface markers. Phase 1 trials in 2024 reported safe administration with antitumor activity in advanced cases, while 2025 preclinical advances in mouse models show tumor shrinkage without systemic toxicity, paving the way for localized delivery strategies.[219][220] Looking toward 2025, forecasts highlight neoadjuvant poly(ADP-ribose) polymerase (PARP) inhibitors for high-risk localized prostate cancer, particularly in patients with DNA repair deficiencies, to downstage tumors prior to surgery and reduce recurrence risk. Phase 2 trials, such as those with niraparib, demonstrate pathologic responses and molecular changes, supporting their integration into preoperative regimens for genetically selected cohorts.[221] Additionally, microbiome modulation trials are emerging as a novel frontier, exploring gut microbiota alterations to influence prostate cancer progression via the gut-prostate axis. Early studies link microbial shifts to androgen metabolism and therapy resistance, with interventions like probiotics or fecal microbiota transplants under evaluation to enhance treatment outcomes.[222]

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