Parity and Colorectal Cancer Risk in Women2

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Abstract
A case-control study is reported of reproductive history and colorectal cancer risk based on information obtained from interviews with white women 40–79 years old who were admitted to Roswell Park Memorial Institute between the years 1957 and 1965. Women with the primary diagnosis of carcinoma of the colon (n = 284) and carcinoma of the rectum (n = 270) did not differ significantly in their prior reproductive histories as compared to those of a control group of women (n = 1,763) with nonneoplastic diseases not affecting the breast or reproductive sites. The pertinent literature suggesting a paritycolorectal cancer association in women is reviewed. The conclusion reached is that the evidence for a parity-colorectal cancer association is equivocal; but that if such an association exists, it is probably weaker than that seen for cancers of the breast, ovary, and uterine corpus.

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