Abstract
Background: Early Post-operative Intra-Peritoneal Chemotherapy (EPIC) following Cytoreductive Surgery (CRS) and Hyperthermic Intra-Peritoneal Chemotherapy (HIPEC) in high-grade appendiceal peritoneal cancer remains controversial with unclear survival benefit. The following study evaluates the survival outcomes in highgrade appendiceal cancer patients receiving varying days of EPIC in addition to CRS and HIPEC, and if survival varied between different appendiceal cancer subtypes. Patients and Methods: A monocentric retrospective analysis of patients with high-grade appendiceal cancers managed from 1994 to 2018 was undertaken. An analysis was performed comparing survival between patients who received HIPEC, HIPEC+EPIC, HIPEC+EPIC <3 days and HIPEC+EPIC ≥3days. All patients received CRS. Results: 212 patients were included in the study. The 5years overall survival was 60% and 55% in the HIPEC+EPIC and HIPEC groups respectively. Patients who received ≥3days of EPIC had an 8% reduction in risk of death compared to those who had <3 days (HR 0.92, CI 0.89-0.94), with a 5-year survival of 62% in the ≥3days group compared to 55% in the <3day group. Patients with signet cell carcinoma had the greatest 5year survival advantage when both HIPEC and EPIC were given (HR 01.23, CI 01.21-01.26). Conclusion: EPIC in combination with HIPEC and CRS offers survival benefit at 5years in high-grade appendiceal peritoneal cancer and is most advantageous in signet cell carcinoma. Completing a ≥3day course of EPIC increases chance of survival at 5years compared to a <3 days course.
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