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Vismodegib
Vismodegib
Vismodegib
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Vismodegib
Clinical data
Pronunciation/ˌvɪsmoʊˈdɛɡɪb/
VIS-moh-DEG-ib
Trade namesErivedge
Other namesGDC-0449, RG-3616
AHFS/Drugs.comMonograph
License data
Pregnancy
category
  • AU: X (High risk)[1]
Routes of
administration		By mouth
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability31.8%
Protein binding>99%
Metabolism<2% metabolised by CYP2C9, CYP3A4, CYP3A5
Elimination half-life4 days (continuous use),
12 days (single dose)
ExcretionFecal (82%), Urinary (4.4%)
Identifiers
  • 2-Chloro-N-(4-chloro-3-pyridin-2-ylphenyl)-4-methylsulfonylbenzamide
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.234.019 Edit this at Wikidata
Chemical and physical data
FormulaC19H14Cl2N2O3S
Molar mass421.29 g·mol−1
3D model (JSmol)
  • CS(=O)(=O)C1=CC(=C(C=C1)C(=O)NC2=CC(=C(C=C2)Cl)C3=CC=CC=N3)Cl
  • InChI=1S/C19H14Cl2N2O3S/c1-27(25,26)13-6-7-14(17(21)11-13)19(24)23-12-5-8-16(20)15(10-12)18-4-2-3-9-22-18/h2-11H,1H3,(H,23,24)
  • Key:BPQMGSKTAYIVFO-UHFFFAOYSA-N

Vismodegib, sold under the brand name Erivedge, is a medication used for the treatment of basal-cell carcinoma (BCC).[2] The approval of vismodegib on January 30, 2012, represents the first Hedgehog signaling pathway targeting agent to gain U.S. Food and Drug Administration (FDA) approval.[3] The drug is also undergoing clinical trials for metastatic colorectal cancer, small-cell lung cancer, advanced stomach cancer, pancreatic cancer, medulloblastoma and chondrosarcoma as of June 2011.[4] The drug was developed by the biotechnology/pharmaceutical company Genentech.[3]

Indication

[edit]

Vismodegib is indicated for people with basal-cell carcinoma (BCC) which has metastasized to other parts of the body, relapsed after surgery, or cannot be treated with surgery or radiation.[3][5]

Mechanism of action

[edit]

The substance acts as a cyclopamine-competitive antagonist of the smoothened receptor (SMO) which is part of the Hedgehog signaling pathway.[4] SMO inhibition causes the transcription factors GLI1 and GLI2 to remain inactive, which prevents the expression of tumor mediating genes within the hedgehog pathway.[6] This pathway is pathogenetically relevant in more than 90% of basal-cell carcinomas.[7]

Side effects

[edit]

In clinical trials, common side effects included gastrointestinal disorders (nausea, vomiting, diarrhoea, constipation), muscle spasms, fatigue, hair loss, and dysgeusia (distortion of the sense of taste).[2]

Development

[edit]

Vismodegib has undergone several promising phase I and phase II clinical trials for its use in treating medulloblastoma.[8]

References

[edit]

Further reading

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Vismodegib

View on Grokipedia
from Grokipedia
Vismodegib, sold under the brand name Erivedge, is an oral medication approved for the treatment of adults with metastatic or with locally advanced that has recurred following or for whom is not an option, or who are not candidates for . It functions as a first-in-class small-molecule inhibitor of the Hedgehog signaling pathway, specifically targeting the receptor to block aberrant pathway activation driven by mutations in the Patched receptor, a common feature in . Developed by , vismodegib was initially approved by the U.S. in January 2012 based on results from phase I and II clinical trials demonstrating objective response rates of approximately 30-50% in patients with advanced disease. The drug is administered as a 150 mg capsule taken once daily until progression or unacceptable occurs, with a of about 32% and a of approximately 12 days, allowing for steady-state plasma concentrations within one month. In pivotal trials, such as the ERIVANCE BCC study, vismodegib showed durable responses, with median of 9.5 months in metastatic cases and tumor shrinkage in over 40% of locally advanced cases, marking a significant advance for patients ineligible for standard local therapies like or . Long-term follow-up data from these studies confirm sustained efficacy in select patients, though many discontinue due to adverse effects, with response rates maintained in those who continue therapy. Key warnings include severe embryo-fetal toxicity, as vismodegib can cause , birth defects, or fetal death; it is contraindicated in , and females of reproductive potential must use effective contraception during treatment and for 24 months after the final dose, while males must use condoms during treatment and for 3 months after the final dose due to the potential presence of vismodegib in . Common side effects encompass muscle spasms (up to 72% of patients), alopecia (58%), (altered taste, 47%), (46%), and (40%), which are generally manageable but lead to discontinuation in about 30-50% of cases; rare but serious risks include and . Vismodegib represents a milestone for hedgehog-driven cancers, influencing subsequent developments in pathway inhibitors like sonidegib, though its use remains limited to advanced settings.

Medical Uses

Indications

Vismodegib is indicated for the treatment of adults with metastatic (BCC) or with locally advanced BCC that has recurred following or for whom is not an option, and who are also not candidates for . This approval, granted by the FDA in 2012, targets patients with advanced disease where local therapies are infeasible or have failed. Patient selection for vismodegib primarily involves tumors driven by dysregulation of the signaling pathway, with over 90% of BCC cases harboring mutations such as loss-of-function alterations in or activating mutations in SMO. In the pivotal ERIVANCE BCC phase II trial, vismodegib demonstrated objective response rates of 30-50% in patients with metastatic BCC and 40-60% in those with locally advanced BCC, as assessed by independent and investigator reviews, establishing its clinical benefit in this population. These responses highlight vismodegib's role in shrinking tumors and delaying progression in pathway-dependent advanced BCC. Beyond its approved use, vismodegib has been investigated in clinical trials for other Hedgehog-driven malignancies, including sonic hedgehog-subgroup and advanced , as an emerging option. As of 2025, ongoing trials are exploring its use in other settings, such as platinum-resistant and adaptive dosing strategies for advanced .

Dosage and Administration

Vismodegib is administered as a 150 mg oral capsule once daily until progression or unacceptable . The capsules should be swallowed whole and not opened or crushed, and the medication may be taken with or without food. If a dose is missed, the next scheduled dose should be taken without doubling up. Treatment should continue until radiographic confirmation of progression. For dose modifications, therapy may be interrupted for up to 8 weeks in cases of intolerable adverse reactions until improvement or resolution to a manageable level. Upon recovery, treatment can resume at the same dose. Permanent discontinuation is recommended for severe cutaneous reactions, such as Stevens-Johnson syndrome, , or drug reaction with and systemic symptoms, as well as for recurrent, severe, or intolerable musculoskeletal adverse reactions. Monitoring during treatment includes baseline and periodic assessments of serum creatine phosphokinase and levels, with ongoing evaluation as clinically indicated, particularly for muscle symptoms. Regular dermatologic examinations are advised to screen for new cancers, conducted at every follow-up visit. Blood tests for , liver function, , electrolytes, and renal function should be performed at months 1 and 3, then every 3 months in the first year and every 3–6 months thereafter. Tumor assessments, using and imaging (e.g., MRI or CT) per RECIST criteria, are recommended every 3 months (approximately 8–12 weeks) for measurable lesions. The duration of therapy is continuous until progression or toxicity, with real-world studies reporting a median treatment duration of 6–10 months, such as 8 months in a multicenter cohort of advanced basal cell carcinoma patients.

Pharmacology

Mechanism of Action

The Hedgehog (Hh) signaling pathway plays a critical role in embryonic development and tissue homeostasis by regulating cell growth, proliferation, and differentiation. In its canonical form, the pathway is initiated when Hh ligands—such as Sonic Hedgehog (SHH), Indian Hedgehog (IHH), or Desert Hedgehog (DHH)—bind to the Patched (PTCH) receptor, a 12-transmembrane protein that normally inhibits the downstream effector Smoothened (SMO), a 7-transmembrane G-protein-coupled receptor. This ligand binding relieves PTCH-mediated suppression, allowing SMO to translocate to the primary cilium and activate the GLI family of transcription factors (primarily GLI1 and GLI2). Activated GLI proteins then translocate to the nucleus, inducing the expression of target genes such as Cyclin D, Bcl-2, and N-Myc, which promote cell proliferation, survival, and inhibit apoptosis. In adults, the pathway is largely quiescent, but aberrant activation—often due to genetic alterations—drives oncogenesis in certain cancers, including basal cell carcinoma (BCC). Vismodegib, a small-molecule inhibitor, specifically targets the Hh pathway by binding directly to SMO and locking it in an inactive conformation, thereby preventing its and subsequent . This competitive antagonism blocks the release of SMO from PTCH inhibition, halting the translocation and events necessary for GLI . As a result, downstream transcription is suppressed, disrupting the pro-proliferative signals that sustain tumor growth in Hh pathway-dependent malignancies. Unlike non-selective inhibitors, vismodegib exhibits high potency and selectivity for SMO, with no significant off-target effects on related pathways at therapeutic concentrations. Vismodegib's efficacy is particularly pronounced in tumors harboring activating mutations in the Hh pathway, such as loss-of-function mutations in PTCH1 (which remove inhibitory control over SMO) or gain-of-function mutations in SMO itself (which confer ligand-independent activity). These alterations are present in approximately 90% of BCC cases, making vismodegib a for pathway-driven subsets of the disease. In hereditary syndromes like Gorlin syndrome, germline PTCH1 mutations further underscore the pathway's role, and vismodegib effectively counters the resulting constitutive signaling. At the cellular level, vismodegib induces (apoptosis) and arrests the in Hh-dependent tumor cells by downregulating anti-apoptotic proteins like and pro-proliferative cyclins. This leads to reduced tumor burden specifically in pathway-activated cells, with no observable effects on Hh-independent normal tissues or non-responsive tumors, highlighting its targeted therapeutic window. Preclinical models demonstrate rapid suppression within hours of exposure, correlating with decreased viability in BCC cell lines harboring PTCH1 or SMO mutations.

Pharmacokinetics

Vismodegib displays nonlinear pharmacokinetics characterized by saturable absorption and distribution, with steady-state plasma concentrations achieved within 7 days of once-daily oral dosing at 150 mg. The average steady-state plasma concentration is approximately 23 μM, and dose escalation beyond this level does not proportionally increase exposure due to saturation mechanisms. Absorption of vismodegib is incomplete, with an absolute oral bioavailability of 31.8% following a single 150 mg dose. Peak plasma concentrations are attained approximately 48 hours after administration, reflecting delayed absorption kinetics. Steady-state conditions are reached after about 7 days of continuous daily dosing, and food intake does not alter steady-state exposure parameters such as Cmax or AUC0-24h. Vismodegib is extensively distributed, with a ranging from 16.4 to 26.6 L. It is highly bound to plasma proteins (>99%), primarily to alpha-1-acid glycoprotein and , and this binding is saturable at therapeutic concentrations. The drug effectively penetrates skin tumors, achieving levels that support its therapeutic activity in . Metabolism of vismodegib is minimal, with greater than 98% of circulating drug-related material consisting of the unchanged parent compound and less than 2% undergoing hepatic transformation primarily via and /5 oxidation, along with minor and ring cleavage pathways. The primary route of clearance involves biliary of the intact drug. Excretion occurs predominantly via the hepatobiliary route, with 82% of the administered dose recovered unchanged in and only 4.4% in . The terminal elimination is approximately 12 days following a single dose but shortens to 4 days under continuous daily dosing conditions at . In special populations, no dose adjustments are necessary for mild hepatic impairment (total bilirubin ≤1.5 times upper limit of normal with elevated AST) or mild to moderate renal impairment ( clearance ≥30 mL/min); however, data are limited for severe hepatic or renal impairment. Pharmacokinetic exposure shows no clinically relevant differences based on sex, age (26–89 years), or body weight (41–140 kg).

Adverse Effects

Common Side Effects

The most common adverse effects of vismodegib, occurring in at least 30% of patients in clinical trials, include muscle spasms, alopecia, (altered taste), , and . Muscle spasms were reported in 72% of patients, often manifesting as cramps in the legs or back, while alopecia affected 64%, typically leading to partial or complete on the , body, and eyelashes. occurred in 55% of cases, frequently described as a metallic or diminished sensation, and in 40%, contributing to overall reduced energy levels. Other notable effects include (30%) and (complete loss of taste, 11%). These incidences are derived from pooled data across phase II trials involving 138 patients with advanced , graded according to the Common Terminology Criteria for Adverse Events version 3.0. Most of these side effects have an early onset, typically within the first month of treatment, with muscle spasms and dysgeusia emerging as the earliest (median onset around 1-2 months). Upon discontinuation of vismodegib, the effects are generally reversible; for instance, taste disturbances often resolve within 1-3 months, and hair regrowth occurs in 3-6 months, though full recovery may vary by individual. Weight loss, reported in 45% of patients with a median decrease of 6-11% of body weight, tends to have a slightly later onset (median around 6 months) but is also reversible with nutritional support post-treatment. Real-world data from the FDA Adverse Event Reporting System (FAERS) analysis through Q1 2024 confirms these high rates, with muscle spasms and alopecia emerging as the most frequent signals, often leading to treatment discontinuation, particularly when occurring early (46% within 60 days; median onset 69 days). This study of over 7,700 reports highlighted that spasms and taste alterations were the primary drivers of intolerance, aligning with findings but underscoring their impact on adherence in broader use. Supportive care strategies focus on symptom management to improve tolerability. For muscle spasms, recommendations include maintaining hydration, supplementation (such as magnesium or ), stretching exercises, and massage; dose interruptions may be considered for severe cases. and associated benefit from nutritional counseling, emphasizing calorie-dense foods, flavor enhancers (e.g., herbs or ), and regular monitoring to prevent . can be addressed with antiemetics if needed, while often improves with rest and activity pacing. These measures, drawn from clinical guidelines, help mitigate effects without altering the core treatment regimen.

Serious Risks and Management

Vismodegib therapy is associated with several serious adverse effects, though these occur at low incidences compared to more common side effects like muscle spasms. , often linked to muscle spasms and subsequent , has been reported as a grade 3 laboratory abnormality in approximately 4% of patients in clinical trials. Elevated levels, indicative of potential renal effects, occur in about 13% of patients overall, with severe (grade 3) affecting 2%. These renal events may require close monitoring of and function, particularly in patients with preexisting conditions. Another concern is the potential for secondary malignancies, such as (cSCC), with an incidence of less than 1% in treated patients; however, some studies have suggested a possible increased for non-basal cell carcinoma skin cancers, though others found no elevated risk compared to surgical standards. Cardiovascular events, including rare instances of , have been documented in post-marketing reports and labels, though their direct attribution to vismodegib remains infrequent. Real-world data indicate that severe muscle spasms can contribute to dehydration or electrolyte imbalances requiring management. Management of these serious risks follows established protocols: for grade 3 or 4 events such as severe or renal impairment, immediate hospitalization may be required for fluid and correction, alongside dose interruption. In cases of recurrent or intolerable musculoskeletal or cardiac events, permanent discontinuation is recommended, while long-term dermatologic surveillance is advised to detect secondary skin cancers early through regular skin examinations. Discontinuation rates due to cumulative toxicities are substantial, reaching approximately 31% in the STEVIE trial, primarily driven by persistent severe effects. In real-world settings, these rates are higher, at 63.5% as reported in a 2022 observational study, underscoring the need for proactive patient education and multidisciplinary monitoring to optimize tolerability.

Contraindications and Precautions

Reproductive Toxicity

Vismodegib is associated with significant , primarily manifesting as embryo-fetal harm. The drug carries a from the (FDA) stating that it can cause embryo-fetal death or severe birth defects when administered to a pregnant , based on its and nonclinical data. Animal reproduction studies demonstrate that vismodegib is embryotoxic, fetotoxic, and teratogenic. In rats, oral administration during at doses of 10 mg/kg/day or higher—corresponding to maternal exposures below the recommended human dose of 150 mg daily—resulted in craniofacial anomalies, missing or fused digits, open , and other skeletal malformations, along with reduced fetal weight and increased post-implantation loss. At doses of 60 mg/kg/day or greater (approximately 2 times the human exposure), complete occurred. These findings underscore the drug's interference with signaling pathway, which is essential for embryonic development. Due to the potential for severe fetal harm, vismodegib is contraindicated in . For females of reproductive potential, pregnancy status must be verified via a negative serum or within 7 days prior to initiating treatment. Vismodegib may impair female , with amenorrhea reported in approximately 30% of premenopausal women during treatment; the reversibility of this effect remains unknown, potentially indicating ovarian toxicity. In male rats, no significant adverse effects on reproductive organs or were observed at doses up to 100 mg/kg/day (about 1.3 times human exposure). Vismodegib is present in human at concentrations of approximately 6.5% of steady-state plasma levels, necessitating precautions to prevent fetal exposure through sexual contact. To mitigate reproductive risks, females of reproductive potential should use effective contraception (e.g., hormonal methods, intrauterine devices, or barrier methods) during treatment and for 24 months after the final dose, reflecting the drug's long and persistence in the body. Males should use condoms with a during treatment and for 3 months after the final dose, even if vasectomized, and refrain from donation during this period to avoid unintended exposure in partners. These recommendations account for the drug's detection in for up to 3 months post-discontinuation. No adequate human data exist on the developmental risks of vismodegib in , as its use is contraindicated; however, the theoretical risk is high given the inhibition of (SMO), a key component of the Hedgehog pathway critical for fetal . The FDA has established a pregnancy exposure registry to monitor outcomes in exposed pregnancies; healthcare providers and patients are required to report any exposures to at 1-888-835-2555 or via the FDA's MedWatch program.

Drug Interactions

Vismodegib is a minor substrate of the enzymes and /5, with more than 98% of the administered dose excreted unchanged, indicating limited metabolic involvement. It acts as a weak inhibitor of , but clinical studies have not identified strong pharmacokinetic interactions arising from this property. Coadministration with moderate and inhibitors, such as , results in a modest 1.3-fold increase in area under the curve (AUC) at , which is not considered clinically significant. However, strong CYP3A inducers like rifampicin may decrease vismodegib exposure, and their concomitant use is not recommended. Vismodegib is a substrate of the efflux transporters (P-gp) and breast cancer resistance protein (BCRP). Clinical evaluations with strong P-gp and inhibitors, such as , demonstrate no clinically relevant changes in steady-state vismodegib , though increased exposure and toxicity risks cannot be entirely ruled out due to transporter involvement. Similarly, a dedicated drug-drug interaction study with , a potent P-gp and CYP3A inhibitor, showed minimal impact on systemic exposure at steady state, supporting low interaction potential. Administration of vismodegib with a high-fat increases single-dose AUC and maximum concentration (Cmax) by approximately 1.7-fold compared to the fasted state, likely due to enhanced and absorption. At steady state with daily dosing, however, food has no significant effect on , and the drug may be taken with or without meals; consistent administration conditions are recommended to minimize variability. No significant pharmacokinetic interactions occur with proton pump inhibitors (PPIs); for instance, reduces unbound vismodegib concentrations by about 33% at steady state, but this change is not clinically meaningful. Similarly, interactions with statins are of low clinical concern for vismodegib exposure, as recent pharmacokinetic/pharmacodynamic analyses confirm minimal bidirectional effects despite vismodegib's predominant biliary excretion route (82% of dose recovered in feces). Overall, vismodegib exhibits a low potential for drug-drug interactions, with monitoring advised primarily for strong CYP3A inducers and transporter modulators.

History and Development

Preclinical and Early Development

Vismodegib, known during development as GDC-0449, was discovered by , a subsidiary of , in the mid-2000s through of small-molecule libraries to identify inhibitors of the (SMO) protein in the signaling pathway. This approach was inspired by natural SMO antagonists like and aimed to target pathway activation implicated in cancers such as (BCC). Genentech collaborated with Curis for validation, optimizing the compound for oral bioavailability and selectivity. Preclinical studies demonstrated vismodegib's potency in blocking signaling. In , it inhibited GLI1 expression, a downstream effector, in BCC-derived cell lines by binding to SMO and preventing pathway activation, with values ranging from 2.8 to 12.7 nM in reporter assays. In , oral administration led to tumor regression in PTCH1-mutant mouse models, including Ptch1+/- allografts of , where it induced rapid shrinkage without significant systemic toxicity at doses up to 100 mg/kg. These models recapitulated -driven tumorigenesis, showing sustained pathway suppression and antitumor effects comparable to those in human xenografts. Early development milestones included the initiation of a phase I trial in January 2007 for patients with advanced solid tumors to standard therapies. Initial pharmacodynamic data from this trial confirmed pathway inhibition, with skin biopsies revealing over twofold reduction in GLI1 mRNA in 73.5% of patients after one week of treatment at doses of 150-540 mg daily. Intellectual property for vismodegib centered on patents filed by between 2003 and 2005 covering SMO antagonists and their use in Hedgehog-related disorders, establishing it as the first-in-class oral inhibitor of this pathway. These filings supported its progression as a for pathway-dependent malignancies.

Clinical Trials and Approvals

The pivotal clinical trials establishing vismodegib's in advanced (BCC) included the ERIVANCE BCC trial, a phase II, single-arm, multicenter study conducted from 2009 to 2010 that enrolled 104 patients with either metastatic (n=33) or locally advanced BCC (n=71). In the metastatic BCC cohort, the investigator-assessed objective response rate was 48.5%, consisting entirely of partial responses, with a median duration of response of 7.6 months. The STEVIE trial, a phase II, open-label, multicenter study from 2012 to 2015, evaluated vismodegib in 1,134 patients with advanced BCC, including 499 with locally advanced disease and measurable lesions at baseline. It demonstrated a 68.5% objective response rate (95% CI, 63.8–72.9) in the locally advanced BCC subgroup, confirming in a broader, real-world-like population while primarily assessing long-term safety. These trials supported vismodegib's role in achieving tumor responses where was not feasible, with primary endpoints focused on objective response rates per modified Response Criteria in Tumors. Vismodegib received its initial regulatory approval from the U.S. (FDA) on January 30, 2012, for the treatment of adults with metastatic BCC or locally advanced BCC that had recurred following surgery or was not suitable for surgery or radiation. The (EMA) granted conditional marketing authorization on July 12, 2013, for the same indications in adults, which was converted to full approval in 2016 following confirmatory data from the STEVIE trial. As of 2025, no additional indications have been approved, though programs have facilitated its use in patients with Gorlin syndrome (basal cell nevus syndrome) to manage multiple BCCs, as evidenced by open-label studies showing tumor burden reduction in this population. Post-approval studies have further characterized vismodegib's performance in . A 2025 pharmacokinetic/pharmacodynamic (PK/PD) analysis in BCC patients treated with vismodegib demonstrated correlations between plasma concentrations and treatment response, noting that lower concentrations were associated with optimal efficacy and reduced risk, supporting personalized dosing strategies. from multicenter retrospective analyses in the , such as the RELIVIS study involving 133 patients with advanced or multiple BCCs, reported an objective response rate of 77.5% but highlighted high discontinuation rates primarily due to s, underscoring the need for in routine use. A May 2025 analysis of s using the FDA Adverse Event Reporting System (FAERS) confirmed the known safety profile of vismodegib, with nearly all patients experiencing at least one treatment-related contributing to discontinuation. Ongoing research as of 2025 includes phase II trials exploring vismodegib in basal cell nevus syndrome. Additional phase II investigations are evaluating vismodegib in combination with for locally advanced, unresectable BCC, with recent data from induction-concurrent regimens showing high local control rates (91%) and exceeding 50% at 2 years, per updates.

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