Among those with ulcerative colitis who did not get colorectal cancer, researchers found that 100 percent used mesalamine. While among those with UC who developed colorectal cancer only 76.9 percent used mesalamine. "This finding suggests an association between mesalamine use and reduced risk of colorectal cancer," according to Jeffrey Tang, M.D. Dr. Tang and his colleagues, including Ann L. Silverman, M.D., conducted conditional logistic regression analysis which revealed that at doses greater than 5068 grams mesalamine use in patients with IBD was associated with an 89 percent reduction in risk of colorectal cancer, compared to IBD patients matched for other major risk factors. While these are provocative findings, it should be noted that this is a small study and further investigation is needed on the chemoprevention potential of mesalamine.
Patients with inflammatory bowel disease including ulcerative colitis and Crohn's disease are at significantly higher than average risk for colorectal cancer and should be screened for colorectal cancer according to accepted guidelines, which recommend more frequent screening among those with IBD. However, some research suggests this is not happening.
In another study conducted at the University of California, San Francisco and Kaiser Permanente of Northern California and presented at the ACG Annual Meeting, researchers looked at rates of participation in colorectal cancer screening by patients with IBD in an integrated health system with access to colonoscopy. An intensive program of colonoscopic screening and surveillance is recommended to prevent colorectal cancer in patients with ulcerative colitis, who are at higher than average risk.
In this study of 358 patients with ulcerative colitis who were eligible for screening, only one third were screened once during the period 2001 to 2005. Of these 123 patients, only 52 percent had an additional surveillance colonoscopy within the recommended period of one to two years. Overall, only 18 percent of the eligible patients at high risk for colorectal cancer due to history of ulcerative colitis adhered to recommended surveillance guidelines.