Medical Treatments that Might Affect Cancer Risk

Some cancer treatments such as chemotherapy and radiation therapy may increase a person's risk of developing a different type of cancer later in life. 

Here you'll find information on hormone replacement therapy (HRT) and how it can affect a woman's risk of getting certain cancers.

Doctors prescribed DES (diethylstilbestrol) from 1938 until 1971 to help some pregnant women who had had miscarriages or premature deliveries. Get info about how DES can affect breast cancer risk.

Abortion does not appear to raise the risk of breast cancer or any other type of cancer. Learn what we know about abortion and breast cancer here.