Pressurised intraperitoneal aerosol chemotherapy (PIPAC): the first Australian experience.

Objectives: Pressurised intraperitoneal aerosol chemotherapy (PIPAC) is a novel surgical technique for patients with peritoneal metastases not amenable to curative treatment. PIPAC delivers pressurised aerosolised chemotherapy using a hyperbaric capnoperitonem established laparoscopically. This study sought to investigate the feasibility and safety of PIPAC in an Australian population.

Methods: We undertook a cohort analysis of prospectively-collected data on patients undergoing PIPAC across two Australian hospitals. Participants were planned to have three PIPAC procedures, each 6 weeks apart. Study outcomes included post-operative complications including 30-day mortality, length of stay (LOS) and patient quality of life (EORTC QLQ-C30 scores).

Results: 18 patients underwent 50 completed procedures. 13 patients had two or more PIPACs. The most common primary malignancy was colorectal cancer (n=8), followed by gastric cancer (n=4), appendiceal cancer (n=4) and mesothelioma (n=2). One grade four but no grade five complications occurred, with zero 30-day mortality. Median LOS was 1 day. Mean EORTC QLQ-C30 score increased from 47.8 at baseline to 53 post second PIPAC. Due to the heterogeneity of our cohort, survival analysis and statistical comparisons were unable to be made.

Conclusion: PIPAC is feasible, safe and well tolerated in an Australian population with a lack of severe complications and zero 30 day mortality. Due to the small number of patients and the heterogeneity of our study's sample, it was not possible to perform survival analysis. The study is nonetheless valuable as the first investigation of implementation of PIPAC in Australia.