Colorectal Omics and OfCS Proteoglycans

Inclusion Criteria: * Patients diagnosed or with suspicion of colorectal cancer or adenoma, inflammatory bowel disease, late complications to colon diverticulosis, colostomy reversal or other diagnoses requiring colorectal resection. * Patients planned to undergo elective surgical procedures coded as KJFB20-KJFB99, KJFG30-37 or KJGB00-97 according to the Danish modification of the NOMESCO Classification of Surgical Procedures * Able to speak Danish, English, or other languages where professional interpretation is available * Able to give informed consent Exclusion Criteria: * Patients undergoing synchronous: liver resection (patients undergoing metastasectomies can be included); total gastrectomy or cardia resection; Whipple's procedure or another major pancreatic resection (resections of the pancreatic tail can be included); total or partial nephrectomies or cystectomy * Patients previously included in the study * Patients known to be pregnant (pregnancy test not required) * Non-resident in Denmark