Meaningful differences and validity for the NCCN/FACT‐P Symptom Index: An analysis of the ALSYMPCA data

Abstract

The Functional Assessment of Cancer Therapy–Prostate (FACT‐P) and the National Comprehensive Cancer Network/Functional Assessment of Cancer Therapy–Prostate Symptom Index‐17 (NFPSI‐17) are 2 commonly used measures for patient‐reported outcomes in prostate cancer trials. Their use may be enhanced by a better understanding of how change scores on the measures should be interpreted.