Characteristics of studies of 5-ASA and colorectal neoplasia in patients with ulcerative colitis.

Note: CD: Crohn's disease, NR: not reported, CRN: colorectal neoplasia, CRC: colorectal cancer, AN: advanced neoplasia. *With effect estimates for ulcerative colitis and inflammatory bowel disease. &Percentage of CD in inflammatory bowel disease with CRN.