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Günther Rezniczek, Urs Pabst, Omar Thaher, Clemens Tempfer

• \(\bf Background\) Peritoneal metastasis (PM) in patients with breast (BC) and endometrial cancer (EC) is rare and treatment options are limited. Pressurized IntraPeritoneal Aerosol Chemotherapy (PIPAC) has demonstrated efficacy against PM from various cancers, but its efficacy in BC/EC patients is unknown. \(\bf Methods\) Retrospective cohort study of patients with PM from BC/EC undergoing PIPAC with doxorubicin 1.5 mg/m\(^{2}\) and cisplatin 7.5 mg/m\(^{2}\). Data were collected within an international prospective PIPAC registry. Study outcomes were microscopic tumor regression grade (TRG), survival, adverse events (CTCAE), and quality of life (QoL). \(\bf Results\) 150 PIPAC procedures in 44 patients (BC/EC = 28/16; mean age 58.8 \(\pm\) 10.1 and 63.2 \(\pm\) 10.1 years, respectively) were analyzed. The mean number of PIPACs per patient was 3 (range 0–9) and 3.5 (range 0–10), respectively. Primary/secondary non-access occurred in 4/3 of 150 (5%) procedures. PIPAC induced objective tumor regression as demonstrated by repetitive PM biopsies in 73% (32/44) of patients. Peri- and postoperative CTCAE grade 3 and 4 complications were observed in 12/150 (8%) of procedures. No grade 5 event was observed. After a median follow up of 5.7 (IQR 2.7–13.0) months, overall median survival was 19.6 (95% CI: 7.8–31.5) months (from first PIPAC). QoL indicators (general health, nausea, fatigue, constipation, pain, dyspnea, social, cognitive, emotional, and physical functioning) all improved or were maintained throughout PIPAC treatments. \(\bf Conclusions\) Repetitive intraperitoneal chemotherapy with PIPAC is feasible and safe in patients with PM from BC and EC. PIPAC induces significant histological regression of PM while maintaining QoL.