A large number of women in the population are at risk for the developm
ent of breast cancer. Methods now exist to accurately assess risk and
to provide quantitative estimates of the chance of a woman developing
breast cancer in her lifetime. Histologic assessment of premalignant b
reast pathology aids in the evaluation of risk. The availability of pr
imary chemoprevention clinical trials reduces the number of indication
s for prophylactic mastectomy. Women at risk for breast cancer and wom
en who have had a malignant lesion at another anatomic site have an in
creased risk for new cancers at multiple sites. We propose screening s
trategies based on epidemiologic information about the risks of these
diseases and on the predictive value of the available screening tests.
The merits and inadequacies of specific management strategies are con
sidered. We review the risks and benefits of estrogen replacement ther
apy for women at increased risk for breast cancer and consider the eth
ical implications of both risk assessment and the various intervention
s.