11 doctors weighed in:

Why is having fewer pregnancies or fewer kids a risk factor for cancer of the breast?

11 doctors weighed in
Dr. Steven Tucker
Internal Medicine
5 doctors agree

In brief: Estrogen exposure

Prolonged exposure to and higher concentrations of estrogen increases the risk of breast cancer.
The more pregnancies the fewer menses. Breast feeding accomplishes the same goal. Also age at 1st birth is associated with bc risk too. Check this out from acs: http://bit.Ly/oysxjs.

In brief: Estrogen exposure

Prolonged exposure to and higher concentrations of estrogen increases the risk of breast cancer.
The more pregnancies the fewer menses. Breast feeding accomplishes the same goal. Also age at 1st birth is associated with bc risk too. Check this out from acs: http://bit.Ly/oysxjs.
Dr. Steven Tucker
Dr. Steven Tucker
Thank
Dr. Seema Patel
Holistic Medicine
4 doctors agree

In brief: Later pregnancies

Pregnancy is protective against cancer because there is a natural change in hormone fluctuations.
The estrogen produced in pregnancy, estriol is very protective against breast cancer. However this occurs only if the pregnancy occurs before 30, not after. Breast feeding stops the hormones which can also be protective; so its age, how often pregnant and breast feeding that are the factors to see.

In brief: Later pregnancies

Pregnancy is protective against cancer because there is a natural change in hormone fluctuations.
The estrogen produced in pregnancy, estriol is very protective against breast cancer. However this occurs only if the pregnancy occurs before 30, not after. Breast feeding stops the hormones which can also be protective; so its age, how often pregnant and breast feeding that are the factors to see.
Dr. Seema Patel
Dr. Seema Patel
Thank
Dr. Ray Tidman
Family Medicine
1 doctor agrees

In brief: Unknown

"risk factor" refers to a statistical association between two items.
We can postulate why , but those at best are informed guesses. With out a controlled scientific experiment , we do not know the true answer. Statistics can mislead us.

In brief: Unknown

"risk factor" refers to a statistical association between two items.
We can postulate why , but those at best are informed guesses. With out a controlled scientific experiment , we do not know the true answer. Statistics can mislead us.
Dr. Ray Tidman
Dr. Ray Tidman
Thank
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