Adjuvant Pressurized Intraperitoneal Aerosol Chemotherapy to Prevent Colorectal Peritoneal Metastases (ProphyPIPAC)

Inclusion Criteria:

1. Histopathological diagnosis of intestinal type, mucinous or signet ring cell adenocarcinoma of the colon (with upper limit of the tumor above peritoneal reflection);
2. curative (microscopically complete) surgery performed by laparotomy or laparoscopy;
3. presence of at least one of the following risk factors for the development of metachronous peritoneal metastases:

   * perforated primary tumor (any T, N0-2b, M0);
   * primary tumor infiltrating the visceral peritoneum (pT4a, N0-2b, M0), or directly invading adjacent organs (pT4b, N0-2b, M0);
4. age \> 18;
5. performance status 2 according to the World Health Organization score;
6. willingness to start adjuvant systemic chemotherapy and post-operative follow-up;
7. Signing of informed consent.

Exclusion Criteria:

1. active sepsis;
2. cardiac function impairment (history of previous heart failure or 40% ejection fraction);
3. renal impairment (serum creatinine \>1.5 normal value or creatinine clearance 60 ml/min);
4. liver function impairment (aspartate aminotransferase, alanine aminotransferase, bilirubin \> 1.5 normal value);
5. bone marrow function impairment (leukocytes 4000 / mm3, neutrophils 1500 /mm3, platelets 80000/mm3);
6. lung function impairment (diagnosis of severe chronic obstructive pulmonary disease or 50% forced expiratory volume at one second or 40% diffusion capacity of lung for carbon monoxide adjusted for age);
7. extra-abdominal and/or hepatic metastases at the Computed Tomography scan of the chest, abdomen and pelvis with intravenous contrast;
8. severe complications (grade 3-4) after primary cancer surgery;
9. haemorrhagic diathesis or coagulopathy;
10. pregnancy or lactation in progress;
11. psychiatric or neurological conditions such as to preclude protocol procedures; 12) contraindications to laparoscopy; 13) known hypersensitivity to oxaliplatin or other platinum containing compounds and/or to any of their excipients; 14) history of previous malignancies treated in the last three years, excluding cutaneous spinocellular carcinoma and/or basocellular carcinoma; 15) prior pre-operative radio-chemotherapy..