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Medline ® Abstract for Reference 37

of 'Adjuvant chemotherapy for resected stage II colon cancer'

Obstruction and perforation in colorectal adenocarcinoma: an analysis of prognosis and current trends.
Chen HS, Sheen-Chen SM
Surgery. 2000;127(4):370.
BACKGROUND: 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.
METHODS: 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).
RESULTS: 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 (P<or = .005). Groups 2 and 3 had a greater incidence of colonic versus rectal cancers (P<or = .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).
CONCLUSIONS: 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.
Department of Colon and Rectal Surgery and General Surgery, Chang-Gung Memorial Hospital, Kaohsiung, Taiwan, Republic of China.