Prophylactic Surgery Plus HIPEC With CO2 in Patients Affected by Colorectal Carcinoma. CHECK Study.

Inclusion Criteria: 1. Patients with histologically documented colorectal adenocarcinoma eligible for R0, 1. Presurgical or intraoperative stage T4a or T4b primary tumour (TNM 8 th) 2. Urgent presentation: perforation without purulent generalized peritonitis or fecal peritonitis 3. Peritumoral minimal peritoneal carcinomatosis: limited peritoneal disease in close proximity to the primary tumour, that may be removed en bloc 4. Ovarian metastases (Krukenberg tumor) 2. Age ≥ 18 and ≤75 years 3. Written informed consent Exclusion Criteria: 1. Distant metastatic disease (even if limited and completely resected) 2. History of tumour diagnosed in the 3 years before entering the study, except for topical and healed pathologies that do not need further treatment (e.g. non-melanoma skin carcinomas, superficial bladder carcinomas or in situ carcinoma of the breast or cervix). 3. Psychological, family or social conditions which may negatively affect the treatment and follow-up protocol. 4. Poor general conditions (ECOG \> 2). 5. Impaired cardiac function (history of congestive heart failure or FE \<40%). Clinically significant cardiovascular disease: cerebral vascular accident/stroke (\<6 months prior to enrolment), myocardial infarction (\<6 months prior to enrolment), unstable angina, congestive heart failure (New York Heart Association Classification Class \> II or serious uncontrolled cardiac Arythmia requiring medication 6. Impaired renal function (creatinine\> 1.5 upper limit of normal or creatinine clearance \<60 mL / min) 7. Impaired hepatic function (AST, ALT \>2.5 upper limit of normal, bilirubin\> 1.5 upper limit of normal) 8. Impaired hematopoietic function (leucocytes \<4000 / mm3, neutrophils \<1500 / mm3, platelets \<100000 / mm3) 9. Impaired pulmonary function (presence of COPD or other pulmonary restrictive conditions with FEV1 \<50% or DLCO \<40% of normal age value). 10. Pregnancy 11. History or presence of other diseases, metabolic dysfunction, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates use of HIPEC or chemotherapy or patient at high risk from treatment complications. 12. Chronic inflammatory bowel disease 13. Patients with acute bowel obstruction 14. Refusal to join the study