2016 Volume 62 Issue 6 Pages 472-478
Objective: The aim of this study is to elucidate underlying distinctive common features of currently used measures.
Patients: This study was conducted as a part of nationwide cross-sectional and observational study of “Prostate cancer background, quality of life (QOL), patient’s satisfaction and treatment survey by Japan Prostate Cancer Study Group (J-CaP)”. PCa survivors were invited to answer Short Form 36 (SF-36), Expanded Prostate Cancer Index Composite (EPIC), Functional Assessment of Cancer Therapy (FACT) through the web page of J-CaP.
Methods: Significant conceptual components of three health-related quality of life (HRQoL) questionnaires: EPIC, FACT, and SF-36 were identified by principle component analysis in Japanese patients.
Results: All of the questions from EPIC, FACT, and SF-36 were classified into 9 categories by principle component analysis. Our result suggests that a more feasible and integrated HRQoL measure can be created based on those components identified in our study.
Conclusion: Three HRQoL questionnaires containing 128 questions in total could be narrowed down to 9 principle components. Our future assignment is to create an integrated and more feasible version of scoring system that comprehensively covers these 9 components.