Abstract
The greater age-adjusted risk for colorectal cancer in men than in women is often attributed to estrogen's protective effect in premenopausal women. In addition, postmenopausal hormone use has been associated with reduced colorectal cancer risk. This effect of reproductive hormones has raised the question of whether ovarian stimulation for in vitro fertilization (IVF) can affect colorectal cancer risk. In a nationwide Dutch cohort …
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