Colorectal and extracolonic malignancy in ulcerative colitis

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Abstract
In a review of 1248 cases of ulcerative colitis seen at the Cleveland Clinic that were followed up to 1984 (mean, 14.4 years), 82 patients (6.5%) were subsequently found to have colorectal cancer and 48 (3.8%) had extracolonic malignancy, 6 of them with associated colorectal cancer. Most patients with colorectal cancer were men (2:1), and had extensive (90%) and long-lasting colitis (10 years or more in 93% of cases; mean 18 years). Colitis was inactive before the diagnosis of cancer in 48%. Acute onset of the first attack was rare (7%), and the disease had a remittent course in 92%. The mean age at diagnosis of cancer was 43 years. The cumulative risk of colorectal cancer was significantly higher in patients with extensive colitis than in those with left-sided disease (P < 0.0001: 11.9% vs. 1.8% at 20 years and 25.3% vs. 3.7% at 30 years). When comparing mean duration of disease, left-sided colitis (22 years) did not differ significantly from extensive disease. The tumor was multifocal in 13.5%, proximal to the splenic flexure in 44%, and poorly differentiated in 34% of the cases. The diagnosis was suspected clinically in 64% of cases. The prognosis of colorectal cancer in patients with ulcerative colitis appears to be similar to that in the general population. The cumulative 5-year survival rate was 54%. This Study supports the concept that surveillance colonoscopy should be started after 8 to 10 years of extensive colitis and after 15 years of left-sided colitis. Among those with extracolonic malignancy, the incidence of bile duct carcinoma, leukemia, bone tumors, and endometrial cancer was significantly greater than expected (P < 0.01), whereas that of lung cancer was significantly lower than expected (P < 0.01).