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Cytoreductive surgery and heated intraperitoneal chemotherapy for peritoneal carcinomatosis from rare etiologies.

BACKGROUND: Cytoreductive surgery and heated intraperitoneal chemotherapy (CRS/HIPEC) are commonly used in the treatment of peritoneal carcinomatosis (PC) originating from colorectal, appendiceal and ovarian cancers. It is unclear what benefit CRS/HIPEC might have for PC from uncommon etiologies, therefore we sought to describe local practice patterns and evaluate overall survival (OS).

METHODS: All patients who had CRS/HIPEC between 2000 and 2016 were identified using our institutional cancer database. Patients with appendiceal, colorectal, and ovarian pathologies were excluded. Kaplan-Meier curves were used to estimate and demonstrate 5-year OS. Cox regression analysis was performed to determine factors associated with OS.

RESULTS: Of all patients treated with CRS/HIPEC at our institution, 38 were treated for PC of rare origin. Etiologies included 23 patients with mesothelioma, 8 with primary peritoneal carcinoma, 4 with small bowel tumours and 3 with gastric cancer. Median OS of 35.4, 20.8, 25.4, and 20.2 months were obtained for each group respectively. 5-year OS for each pathology was 8.7%, 0.0%, 25.0%, and 33.3% respectively with corresponding mean PCI of 31.3, 23.6, 21.5, and 12.7. No independent prognostic factors were significant on Cox regression analysis. Median length of stay was 19 days. Readmission rate within 30 days of discharge was 7.9%. Rate of Grade III/IV complications was 34.2%. No thirty-day mortality.

CONCLUSION: Survivals beyond 20 months can be obtained with the use of CRS/HIPEC for rare PC etiologies aligning with results of other groups. CRS/HIPEC in well-selected patients demonstrates a clinical benefit and this could be confirmed with a multi-institutional study.

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