who has had an abortion. And for the same reason, also.
Being pregnant past 5/6 month confers some immunity for breast cancer. The lower risk flattens after 3/4 kids.
Are any pregnancy-related factors associated with a lower risk of breast cancer?
Some pregnancy-related factors have been associated with a reduced risk of developing breast cancer later in life. These factors include the following:
Early age at first full-term pregnancy: Women who have their first full-term pregnancy at an early age have a decreased risk of developing breast cancer later in life. For example, in women who have a first full-term pregnancy before age 20, the risk of developing breast cancer is about half that of women whose first full-term pregnancy occurs after the age of 30 (4). This risk reduction is limited to hormone receptor-positive breast cancer; age at first full-term pregnancy does not appear to affect the risk of hormone receptor-negative breast cancer (5, 6).
Increasing number of births: The risk of breast cancer declines with the number of children borne. Women who have given birth to five or more children have half the risk of women who have not given birth (7). Some evidence indicates that the reduced risk associated with an increased number of births may be limited to hormone receptor-positive breast cancer.
http://www.cancer.gov/cancertopics/factsheet/Risk/reproductive-history
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