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Cure

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Cure

A cure is a substance or procedure that resolves a medical condition. This may include a medication, a surgical operation, a lifestyle change, or even a philosophical shift that alleviates a person's suffering or achieves a state of healing. The medical condition can be a disease, mental illness, genetic disorder, or a condition considered socially undesirable, such as baldness or insufficient breast tissue.

An incurable disease is not necessarily a terminal illness, and conversely, a curable illness can still be fatal.

The cure fraction or cure rate—the proportion of people with a disease who are cured by a given treatment—is determined by comparing disease-free survival in treated individuals against a matched control group without the disease.

Another method for determining the cure fraction and/or "cure time" involves measuring when the hazard rate in a diseased group returns to the hazard rate observed in the general population.

The concept of a cure inherently implies the permanent resolution of a specific instance of a disease. For example, a person who recovers from the common cold is considered cured, even though they may contract another cold in the future. Conversely, a person who effectively manages a disease like diabetes mellitus to prevent undesirable symptoms without permanently eliminating it is not considered cured.

Related concepts with potentially differing meanings include response, remission, and recovery.

In complex diseases like cancer, researchers use statistical comparisons of disease-free survival (DFS) between patients and matched, healthy control groups. This approach equates indefinite remission with a cure. The Kaplan-Meier estimator is commonly used for this comparison.

The simplest cure rate model was published by Joseph Berkson and Robert P. Gage in 1952. In this model, survival at any given time equals the sum of those who are cured and those who are not cured but have not yet died or, in diseases with asymptomatic remissions, have not yet experienced a recurrence of signs and symptoms. Once all non-cured individuals have died or experienced disease recurrence, only the permanently cured population members remain, and the DFS curve becomes flat. The earliest point at which the curve flattens indicates when all remaining disease-free survivors are considered permanently cured. If the curve never flattens, the disease is formally considered incurable (with existing treatments).

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