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BACKGROUND Therapy of peritoneal metastases (PM) in solid organ transplant recipients is challenging. Pressurized intraperitoneal aerosol chemotherapy (PIPAC) might constitute a new therapeutic opportunity for these patients. MATERIAL AND METHODS This was a single-center, retrospective analysis of prospective registry data (NCT03210298) in a tertiary care center between 1.7.2016 and 31.12.2017. Intraperitoneal administration of oxaliplatin 92 mg/m² body surface or a combination of cisplatin 7.5 mg/m² and doxorubicin 1.5 mg/m², repeated every 6 weeks. Objective tumor response was documented via histology (Peritoneal Regression Grading Score, PRGS), adverse events according to Common Terminology Criteria for Adverse Events (CTCAE) 4.0. RESULTS Out of 71 consecutive patients treated with PIPAC, 2 patients (2.8%) were solid organ transplant recipients. The first patient had metachronous PM of colonic cancer origin after liver transplantation. The second patient had synchronous PM of pancreatic cancer origin after combined kidney-pancreas transplantation. After repeated combined systemic and PIPAC chemotherapy, objective histological response was documented in both patients. No adverse events &gt;CTCAE 2 were recorded. There was no measurable liver or renal toxicity. PIPAC procedures could be repeated (2, resp. 3 cycles) without any interruption of immunosuppressive medication or impairment of respective plasmatic drug levels. The first patient passed away 7 months after the first PIPAC, the second patient was still alive after 8 months. CONCLUSIONS PIPAC can induce objective regression of PM in solid organ transplant recipients without inducing organ toxicity or interfering with immunosuppressive therapy.

Pressurized Intraperitoneal Aerosol Chemotherapy (PIPAC) for Peritoneal Metastases in Solid Organ Graft Recipients: First Experience