Inclusion and exclusion criteria
tumor, colon cancer, a left-sided colon or upper rectal tumor
TUMOR, INFILTRATION, LOCAL INFILTRATION, BOWEL PERFORATION, DISEASE, PULMONARY METASTASES, COLON CANCER, MALIGNANCIES, PRIMARY TUMOR, LIVER METASTASES, METASTASES, RECTAL CANCER
Inclusion criteria:Patients with a left-sided colon or upper rectal tumor (from the splenic flexure to the intraperitoneal rectum with the tumor located more than 12 cm from the anal verge) undergoing curative treatmentThe tumor must be highly suspicious for colon cancer in CT or endoscopyColonic dilatation confirmed by CT or X-rayThe tumor, including potential metastases, must be deemed suitable for curative resection◦ Liver metastases must be deemed completely resectable (R0) during the primary tumor resection (subcapsular metastases or metastases requiring removal of no more than tree liver segments simultaneously with the primary tumor)◦ Pulmonary metastases that require maximum unilateral lobectomy for curative purposes without infiltration of the main bronchus or central pulmonary artery/veinPatients aged 18 years or olderWritten informed consent provided.No prior or concurrent malignancies within the 2 years preceding the enrollmentExclusion criteria:Right-sided colon tumorExtraperitoneal rectal cancer of the lower and middle third (tumor located less than 12 cm from the anal verge)Life expectancy less than 120 daysLocally advanced tumor disease with local infiltration of adjacent structures that precludes R0 resection or necessitates neoadjuvant treatmentPatients receiving palliative treatmentEvidence of bowel perforation on CT or X-rayPatients deemed ineligible for surgery (ASA score ≥ IV)Lack of compliancePresence of addiction or other medical conditions that hinder the individual’s ability to comprehend the nature and consequences of the clinical trial.