Breast cancer health centre

Breast cancer and pregnancy

Breast cancer signs can be hard to notice during pregnancy because of all the other changes happening to the breasts.

Breast cancer tumours in pregnant women are often larger and more advanced by the time they are detected than lumps in women of the same age who are not pregnant. Although pregnancy doesn't cause breast cancer, the hormonal changes in the body can accelerate its growth.

How is breast cancer diagnosed in pregnant women?

The best thing you can do while pregnant is to see your doctor and midwife regularly as advised. These visits, called antenatal (or ‘before birth’) visits, are very important in keeping both you and your baby in the best possible health. Tell your doctor or midwife about any concerns you have about your breasts.

If a suspicious lump is found, your doctor will refer you to a specialist breast clinic and you will be likely to have a mammogram or an ultrasound. As in all procedures that expose you to radiation when you are pregnant, the technicians will take extra care to shield your baby from radiation during the mammogram.

If the lump is still suspicious after these tests, the specialist will usually perform a biopsy. In fact your specialist will often recommend that you get a biopsy even if the initial tests come back negative. During the biopsy a small sample of the suspicious tissue will be removed with a needle or by making a small cut. This sample is then thoroughly examined using a microscope and other methods to detect any cancer cells.

What if I do have cancer? Will I have to lose my baby?

First of all, abortion of the baby does not improve the mother's chances of surviving the cancer.

Second, there is no evidence that breast cancer can harm the baby. What can harm the baby are some of the treatments for breast cancer - and these depend on how far advanced the cancer may be. This is another reason why it is so important to detect these and other cancers early.

If the cancer is still in the early stages (Stage I or II), the doctor will most likely recommend that you have surgery to remove either the suspicious lump ( lumpectomy) or the affected breast ( mastectomy). During the operation the surgeon will examine the lymph nodes to see whether any are affected and will (usually) remove the lymph nodes where the cancer is most likely to have spread. If it is necessary to give chemotherapy, your doctor will usually wait until after the first trimester to reduce the chances that it will harm the baby.

If the cancer is more advanced (Stage III or IV), the situation can become very complicated. If radiotherapy is needed to treat the cancer, it can be very hard to protect the baby. Additionally, these cancers usually require both surgery and chemotherapy, so the risk of harming the baby is much higher. There have been instances where the cancer is advanced to the point where any treatment is not likely to add more than a year or two to the woman's life. In these cases whether or not to undergo the treatment and risk harming the baby can be an agonising decision for both the woman and her family.