Use of exogenous hormones by women and colorectal cancer: evidence from the Royal College of General Practitioners' Oral Contraception Study

Ever users of oral contraceptives do not benefit from a long-term reduction in colorectal cancer, although current and recent use may confer some protection. Women who have ever used HRT appear to have important reductions in their risk of colorectal cancer, especially while using these hormones. Further study is needed in order to determine how long any benefits last and whether these are stronger in women exposed to both classes of exogenous hormones.