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Background  Peritoneal metastasis (PM) develop in more than 50 % of gastric cancer (GC) patients. Median survival without treatment is not more than 3–7 months, and 8–12 months after modern combination chemotherapy. Innovative therapeutic approaches are urgently needed.    Methods  Phase-2, open label prospective clinical trial assessing safety and efficacy of bidirectional chemotherapy for treating peritoneal metastasis of gastric cancer (PMGC). Treatment protocol included initial staging laparoscopy or laparotomy, 3–4 courses of systemic chemotherapy (XELOX) followed by Pressurized IntraPeritoneal Aerosol Chemotherapy (PIPAC) procedures every 6 weeks until progression of disease or death. Primary endpoints were overall survival and histological peritoneal regression grading score after rebiopsy.    Results  31 patients were included (9 men, 22 women, mean age 52 years), 24 with synchronous PM at diagnosis, 7 with metachronous PM after previous chemotherapy. Mean PCI was 13.8 (min-max 6–34). XELOX was administered in all patients and combined with 56 PIPAC procedures. Complete and partial pathological response was found in 60 % of the 15 patients eligible for tumor response assessment (4 and 5 patients, respectively). Median survival was 13 months.    Conclusions  Bidirectional chemotherapy combining XELOX with PIPAC with cisplatin and doxororubicin is well tolerated, can induce objective tumor regression and is associated with a promising survival in PMGC.

pleura and peritoneum

Bidirectional chemotherapy in gastric cancer with peritoneal metastasis combining intravenous XELOX with intraperitoneal chemotherapy with low-dose cisplatin and Doxorubicin administered as a pressurized aerosol: an open-label, Phase-2 study (PIPAC-GA2)