Breast cancer during pregnancy

Getting diagnosed with breast cancer whilst pregnant

You are likely to feel a range of emotions after a diagnosis breast cancer whilst pregnant. These may include anger, sadness or fear.

Most women are able to carry on with their pregnancy. Rarely, some women may need to think about whether to end the pregnancy (termination). Your doctor will discuss all of your options with you.

Deciding to end your pregnancy is a very difficult decision and only you can make it. It can help to discuss your options with your partner, family and friends. You can also speak to your breast care nurse, cancer specialist and your obstetrician.

There is no good research evidence to show that being pregnant makes a cancer grow more quickly.

How doctors diagnose breast cancer during pregnancy

Your breasts change when you are pregnant, becoming ready for breastfeeding. The breast tissue becomes more dense. Dense breast tissue has less fat and more breast cells and connective tissue. 

This can make it more difficult to find changes in the breasts. See your GP if you notice:

• a lump

• discharge from your nipple

• skin changes on your breast

They will examine you and if they have any concerns they will refer you to a breast clinic.

The first test you have is an ultrasound scan. This uses sound waves and is safe for your baby.

To find out if there is cancer you usually have an ultrasound guided biopsy. The doctor uses an ultrasound probe to find the abnormal area and take a tissue sample (biopsy). The biopsy is then sent to the laboratory to be looked at under the microscope.

You might also have an x-ray of your breast (mammogram). To protect your baby they will shield them from the radiation if you need to have one.

There are some tests that doctors don’t usually recommend if you’re pregnant, including CT scans and bone scans. This is due to the potential risk to the baby from the radiation. Your team will usually use other types of tests such as an ultrasound, MRI or x-ray to check other parts of the body. 

Find out about tests to diagnose breast cancer

Treating breast cancer during pregnancy

The aim is to balance treatment for your cancer and keeping your baby safe and well. You have a team looking after you and making a plan for your treatment. This includes your cancer doctors, breast care nurse, obstetrician and midwife.

Doctors try and keep your treatment as close as possible to what someone who isn’t pregnant would have. This includes not delaying treatment.

The type of treatment you have depends on:

• your wishes

• how many weeks pregnant you are (which trimester you are in)

• your type of breast cancer and if your cancer has spread

Surgery

Surgery is possible at any time during pregnancy.

If you need breast reconstruction your team will usually recommend you delay the reconstruction until after you give birth. Having reconstructive surgery at the same time as having the cancer removed can make the operation much longer.

Find out about having surgery

Radiotherapy

Doctors normally recommend having radiotherapy after you’ve given birth. This is because so they don't expose the baby radiation. There are some changes that can be made to help protect your baby if there is no other option than radiotherapy.

Find out more about radiotherapy

Chemotherapy

You can’t have chemotherapy if you are in your first trimester of pregnancy. This is because the chemotherapy can harm the baby.

If you need chemotherapy, your doctor will delay it until you are at least 14 weeks pregnant.

Research shows that after 14 weeks, children exposed to chemotherapy don’t have any more problems than those who aren’t exposed. Chemotherapy can sometimes affect the growth of your baby. You will have regular scans and check ups with your obstetrician.

You stop chemotherapy 2 to 3 weeks before delivery. This is because chemotherapy:

• increases the risk of infection during delivery

• increases your risk of bleeding when giving birth

Find out about chemotherapy

Hormone therapy, immunotherapy and targeted cancer drugs​

Doctors don't recommend hormone treatment, immunotherapy or targeted cancer drugs for breast cancer until after you give birth. As they could harm the developing baby.

You usually start hormone treatment after you've had your baby. You can't have hormone treatment while you are breastfeeding.

Talk this through with your specialist team.

Other treatments

There are lots of ways of controlling sickness or pain for women who are pregnant. Common anti sickness medicines such as ondansetron are safe to take in pregnancy.

Having your baby

Your team will plan for you to have your baby as close to your due date as possible. Depending on your treatment plan and due date your obstetrician might give you medicines to help you have your baby (induce your birth) so you have a vaginal delivery. Or they may recommend that you have a caesarean section. This is when you have an operation to remove your baby through your tummy (abdomen). 

Breast cancer has never been known to spread to a baby. The doctors will collect your placenta after birth and look at it down a microscope. It’s very rare, but cancer cells could spread there.

Breastfeeding

Your cancer doctor and midwife will let you know if you can breastfeed from your affected breast after your baby is born.

Some cancer drugs pass into the breast milk so you may have to wait for a certain amount of time once you finish treatment. If you have had surgery it depends on the type of operation you have had if you are able to breastfeed.

Speak with your healthcare team about breastfeeding.

Practical and emotional support

After you have had your baby you may need to continue breast cancer treatment. This might make caring for your baby more difficult, especially if you have other children at home.

Ask for help if you need it. It might help to plan ahead and find out what people close to you can do to help. You can also speak to you midwife, health visitor and breast care nurse.

Your team can also refer you to a counsellor for extra support at this difficult time.