586PThe accuracy of the clinical PCI score in patients with peritoneal carcinomatosis of colorectal cancer

Abstract Background The Peritoneal Cancer Index (PCI) and completeness of cytoreduction are important prognostic factors in patients with peritoneal carcinomatosis from colorectal cancer, undergoing cytoreductive surgery and hyperthermic intraperitoneal chemotherapy (CRS-HIPEC). The PCI is determined during laparotomy by an experienced surgeon before the decision is made to ‘do’ or ‘do not’ proceed with CRS-HIPEC. The aim of this study is to determine the accuracy of the clinical PCI score (cPCI), by comparing the cPCI with the pathological PCI (pPCI) score. Methods All consecutive patients who underwent CRS-HIPEC for peritoneal carcinomatosis from colorectal origin between February 2015 and June 2018 where identified. Relevant patient- and tumor related characteristics were collected. Results In total 119 patients were included in this study; 60 males (50.4%). Median age was 64 years [IQR 55-71]. The pPCI was lower than the cPCI score in 80 patients (67.2%), the score was equal in 38 patients (31.9%), and in 1 patient (0.8%) the pPCI was higher than the cPCI. The median total cPCI 11 (IQR 6-16) was significantly higher than the median pPCI, (pPCI=8, IQR 3-13, p