Obstruction and perforation in colorectal adenocarcinoma: An analysis of prognosis and current trends☆

In adenocarcinoma of the colon and rectum, obstruction and perforation may occur either alone or together at the site of the neoplasm or proximally. Both events carry a poor prognosis. This retrospective study sought to determine whether a correlation exists between perforation and obstruction, and between these conditions and different clinicopathological factors in colorectal adenocarcinoma.The medical records of 1950 patients with colorectal adenocarcinoma treated in our hospital during a 7-year period were retrospectively analyzed. One hundred patients (5%) were excluded from this study because of a loss of follow-up. Data on clinicopathological factors including age, sex, tumor location, surgical mortality, pathological type, stage, and long-time cancer-free rate were simultaneously analyzed. Patients were grouped as follows: Group 1, complete colonic obstruction without perforation (n = 120). Group 2, complete obstruction with perforation at the site of the cancer (n = 35); Group 3, complete obstruction with perforation proximal to the cancer (n = 13); and Group 4, nonobstructing, nonperforated cancers (n = 1682).When compared with Group 4, Group 1 had a more advanced Dukes' stage, older age, greater incidence of colonic versus rectal cancers, and a poorer cancer-free survival (Por = .005). Groups 2 and 3 had a greater incidence of colonic versus rectal cancers (Por = .004), and Group 3 had a greater operative mortality (P.001). No significant differences were found between Groups 1, 2, and 3. Multivariate analysis revealed that the independent factors favorable to cancer-free survival (5-year survival) were female gender (P = .035), well-differentiated pathology (P.001), uncomplicated cases (P = .004), colon versus rectal location (P.001), and early stage (P.001).The perioperative mortality rate for perforated colorectal cancer at the site of the cancer was 9%; for obstructive colorectal cancer, 5%. Perioperative mortality was much greater for perforations of the colon and rectum occurring proximal to the cancer (31%). Survival was worse (P.001) for patients with obstruction (33%) or perforation proximal to the cancer (33%). The site of perforation did not appear to impact the 5-year survival, although the numbers are relatively small.