Gastric cancer is a major cause of cancer mortality, with poorer prognosis in the presence of peritoneal metastases as low as 2.8–9 months. Systemic therapy has a limited role. Cytoreductive surgery (CRS) and hyperthermic intraperitoneal chemotherapy (HIPEC) have been shown to improve survival. This study evaluates survival of patients with gastric cancer and peritoneal metastases (GCPM) undergoing CRS and HIPEC at an Australian centre.

A retrospective analysis was conducted on a prospectively collected database of patients who underwent CRS and HIPEC for GCPM from January 2009 to December 2023. Data included demographics, perioperative factors, histopathology and survival.

Twenty-four patients were identified, with median postoperative overall survival of 11.7 months (95% CI 8.6–34.2 months). Most patients had poorly differentiated adenocarcinoma (n = 23, 96%), with 14 (58%) exhibiting signet cell pathology. 62% (n = 15) received preoperative chemotherapy. Median PCI was 5, with a CC score of 0 in 96% of patients (n = 23). Clavien-Dindo III/IV morbidity was noted in 8 patients (33%) with no perioperative mortality. No survival differences were found between those with signet cell pathology and those without (10.6 vs. 11.7 months, p = 0.83), nor between those receiving preoperative chemotherapy and those who did not (11.7 vs. 10.6 months, p = 0.60). Age, sex, PCI, CC and tumour markers demonstrated correlations with survival in linear regression, but no individual factor significantly influenced outcomes.

CRS and HIPEC for low volume GCPM should be considered in select patients.