Regional differences of physiological functions and cancer susceptibility in the human large intestine.

Regional differences in function, metabolism and morphology between proximal colon, distal colon and rectum may be important in the pathogenesis and biologic behaviour of tumours originating from these segments. Thus, the effect of primary prevention of colorectal cancer may also differ from one large bowel segment to another. Therefore, this review underscores that one should be careful extrapolating results obtained in a short segment of the large bowel to the entire colorectum. Obviously, future studies concerning the pathogenesis and possibilities for prevention of large bowel cancer should certainly examine results by subsite as a routine procedure.