Reproducibility of the peritoneal regression grading score for assessment of response to therapy in peritoneal metastasis

Abstract

The four‐tiered peritoneal regression grading score (PRGS) assesses the response to chemotherapy in peritoneal metastasis (PM). The PRGS is used, for example, to assess the response to pressurised intraperitoneal aerosol chemotherapy (PIPAC). However, the reproducibility of the PRGS is currently unknown. We aimed to evaluate the inter‐ and intraobserver variability of the PRGS.