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Pregnancy & Cancer

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Pregnancy & Cancer Risk

Breast cancer is hard to detect during pregnancy and some types are breast screening, including mammograms, are considered unsafe during pregnancy. Further, changes in breast tissue during pregnancy can make screening for cancer more difficult. For this reason, high-risk women are recommended to undergo their annual screening before becoming pregnant. Some high-risk women choose to have prophylactic mastectomy before becoming pregnant in order to avoid the challenges of breast screening. This is a very personal decision.  

A research study by Steven Narod, MD and colleagues suggested that pregnancy may affect breast cancer risk in BRCA mutation carriers. The effects vary between women with BRCA1 mutations compared to women with BRCA2 mutations. In BRCA2 carriers, more pregnancies may be associated with higher breast cancer risk. However, the increased breast cancer risk is statistically significant only after four births. In BRCA1 carriers, more pregnancies may be associated with lower risk for breast cancer risk. The decreased risk was statistically significant for breast cancer only after four birth.

A study from Spain showed that pregnancy lowered the risk for breast cancer in women with a BRCA 1 or BRCA 2 mutation. The same study also suggested that pregnancy may lower the risk for ovarian cancer in BRCA 1 but not BRCA 2 mutation carriers. 

Larger research studies are needed to better understand the effects of pregnancy on cancer risk in mutation carriers. 

Pregnancy after breast cancer

In the past, many experts recommended that breast cancer survivors avoid pregnancy. More recently, research has suggests that it is safe for women to become pregnant after breast cancer.  

Several registries and small studies have shown that breast cancer survivors who become pregnant have similar survival to those who do not become pregnant. A meta-analysis, which analyzed 14 studies on pregnancy after breast cancer suggested that pregnancy in women with a history of breast cancer is safe and doesn't compromise overall survival.   

A separate study looking at survival in women with BRCA mutations who were diagnosed while pregnant or became pregnant after breast cancer found that pregnancy did not effect survival for either group of women. This study looked at a relatively small number of women and larger studies will be needed to confirm these findings. 

Breast cancer survivors who wish to get pregnant are usually recommended to wait until they have completed treatment. Not all experts agree on the ideal timing for pregnancy after breast cancer. It is important that women speak with their oncologist before pursuing pregnancy after breast cancer. 


Disclaimer: Health links are made available for educational purposes only. This information should not be interpreted as medical advice. All health information should be discussed with your health care provider. Please read our full disclaimer for more information.

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