Induced abortion boosts breast cancer risk because it stops the normal physiological changes in the breast that occur during a full term pregnancy and that lower a mother’s breast cancer risk. A woman who has a full term pregnancy at 20 has a 90% lower risk of breast cancer than a woman who waits until age 30.
Breast tissue after puberty and before a term pregnancy is immature and cancer-vulnerable. Seventy five percent of this tissue is Type 1 lobules where ductal cancers start and 25 percent is Type 2 lobules where lobular cancers start. Ductal cancers account for 85% of all breast cancers while lobular cancers account for 12-15% of breast cancers.
As soon as a woman conceives, the embryo secretes human chorionic gonadotrophin or hCG, the hormone we check for in pregnancy tests.
HCG causes the mother’s ovaries to increase the levels of estrogen and progesterone in her body resulting in a doubling of the amount of breast tissue she has; in effect, she then has more Type 1 and 2 lobules where cancers start.
After mid pregnancy at 20 weeks, the fetus/placenta makes hPL, another hormone that starts maturing her breast tissue so that it can make milk. It is only after 32 weeks that she has made enough of the mature Type 4 lobules that are cancer resistant so that she lowers her risk of breast cancer.
Induced abortion before 32 weeks leaves the mother’s breast with more vulnerable tissue for cancer to start. It is also why any premature birth before 32 weeks, not just induced abortion, increases or doubles breast cancer risk.
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