progression-free survival

Progression-free survival (PFS) is a term used in medical studies, especially in cancer treatment, to measure the length of time during and after treatment that a patient lives without the disease worsening or spreading. It indicates how effectively a therapy can halt or slow disease progression. PFS helps evaluate treatment benefit, with longer durations generally suggesting better control of the condition. It does not measure overall survival but provides important information about the disease's stability and responsiveness to the treatment.