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ObjectivesThe goal of palliative and supportive care is to improve patients’ quality of life (QoL). Patient-reported outcome measures (PROMs) are the gold standard for the assessment of QoL and symptoms; however, when self-reporting is complicated, PROMs are often substituted with proxy-reported outcome measures, such as clinician-reported outcome measures. The objective of this study was to assess the validity and reliability of the Japanese version of the Integrated Palliative care Outcome Scale (IPOS) for staff (IPOS-Staff).MethodsThis multicenter, cross-sectional observational study was conducted concurrently with the validation of the IPOS for patients (IPOS-Patient). Japanese adult patients with cancer and their staff were recruited. We assessed the characteristics of the patients and staff members, missing values, prevalence, and total IPOS scores. For the analysis of criterion validity, intra-rater, and inter …