Prophylactic PIPAC in Patients With High-risk Colorectal Cancer

"Patients operated for pT4 pN0-2 cM0 pMMR colorectal cancer (of the colon, colorectal junction or high rectum) or patients operated for pT3-4 pN0-2 cM0 pMMR colorectal cancer with positive cytology or in patients with pT3-4 pN0-2 M1c pMMR colorectal cancer with limited peritoneal carcinomatosis which is limited to one abdominal quadrant and was resected during index surgery and no other distant lesion, will undergo 6 months of adjuvant systemic chemotherapy associated with 3 cycles of oxaliplatin-based PIPAC (4-6 weeks apart).~Each PIPAC session will include exploration laparoscopy (with PCI score), peritoneal lavage for cytology and biopsies of healthy peritoneum of the four quadrants + Douglas + omentum), and oxaliplatin-based PIPAC."

Patients operated for pT4 pN0-2 cM0 pMMR colorectal cancer (of the colon, colorectal junction or high rectum) or patients operated for pT3-4 pN0-2 cM0 pMMR colorectal cancer with positive cytology or in patients with pT3-4 pN0-2 M1c pMMR colorectal cancer with limited peritoneal carcinomatosis which is limited to one abdominal quadrant and was resected during index surgery and no other distant lesion, will undergo 6 months of adjuvant systemic chemotherapy, followed by exploration laparoscopy (including 300ml peritoneal lavage for cytology and seven punch peritoneal biopsies in the four quadrants of the abdomen, Douglas and omentum, as well as peritonectomy of 1 cm2) at 6 months after index surgery before entering a standard surveillance program.