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hope4patients

08/27/22 9:49 AM

#508509 RE: Roman516 #508505

PFS is simply a surrogate for overall survival so that trials don’t need to run forever in order to get actual OS numbers. In other words, it’s a prediction of OS. BUT it’s meaningless when you have ACTUAL overall survival numbers because you extended the length of the trial. We also now know PFS is a very bad predictor in immunotherapy because of pseudo progression.