Abstract
A retrospective review of all the 951 patients less than 40 yr of age with colorectal cancer in Denmark 1943-67 is described. The annual incidence in Denmark of colorectal cancer in this age group is 1.4/100,000. These patients do not differ from other patients with colorectal cancer with regard to sex ratio, tumor localization, extent of tumor growth, histologic type, frequency of intestinal obstruction and perforation. Of these patients, 53% were subjected to radical operation. The 5 yr crude survival rate was 32% for all patients and 65% in cases of radical operation. The operative mortality was 9%. The extent of tumor growth according to Dukes'' classification and the presence of intestinal obstruction and/or perforation were the only factors found to influence the prognosis. The survival rates correspond to rates given in the literature in respect to colorectal cancer, regardless of age. Colorectal cancer in young patients apparently differs in no respect from the disease in older patients.

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