What is hormone therapy for breast cancer? Hormone therapy is one of the most common treatments for breast cancer, and it works in a very different way from chemotherapy or surgery. Instead of removing or directly attacking the cancer, it changes the hormonal conditions the cancer depends on to grow.
If your team has mentioned hormone therapy, you may wonder what it involves day to day, how long it lasts, and what effects it can have. This guide explains how it works, who it can help, and the questions worth asking.
What Hormone Therapy Does in the Body
Some breast cancers are sensitive to the hormone estrogen, which means estrogen helps them grow. These cancers are described as hormone receptor positive, because their cells carry receptors that estrogen can attach to, a little like a key fitting into a lock.
Hormone therapy, sometimes called endocrine therapy, works by blocking that signal. Depending on the medicine, it can stop estrogen from reaching the cancer cells, or lower the amount of estrogen the body makes. With the signal weakened, the cancer grows more slowly or stops growing, and any remaining cells are less likely to return.
Who This Treatment Can Help
Hormone therapy is offered when tests on the cancer show hormone receptors are present. If a cancer has no hormone receptors, this treatment is unlikely to help, and other treatments are used instead. Your pathology report will show whether your cancer is hormone receptor positive.
It can be used after surgery to lower the chance of the cancer coming back, and sometimes before surgery to shrink a cancer. It is also used when cancer has spread, to help control it. Whether it is part of your plan depends on your test results, your age, and whether you have been through menopause.
The Main Types of Hormone Therapy in General Terms
There are a few main groups of hormone therapy medicines. One group blocks estrogen from attaching to cancer cells by sitting in the receptors themselves. Another group lowers the amount of estrogen made in the body, and is mainly used after menopause, when the ovaries have stopped producing most estrogen.
Treatment can also involve the ovaries directly. In younger women, the ovaries are the main source of estrogen, so treatment may include medicines that pause their function, or in some cases surgery or radiation to the ovaries. Your team will explain which approach fits your situation, since the choices depend on your age and menopausal status.
How Long Treatment Often Lasts
Hormone therapy is usually a marathon rather than a sprint. It is most often taken as a tablet once a day for at least five years, and for some people treatment continues for up to ten years, because research shows longer treatment can lower the risk of the cancer returning for many years after surgery.
The length recommended for you depends on the features of your cancer, your risk of it coming back, and how well you tolerate the medicine. Some people switch between medicine groups during those years. If side effects trouble you, tell your team rather than stopping suddenly, because there may be another option.
Common Side Effects and Looking After Your Bones and Heart
Because hormone therapy lowers or blocks estrogen, its side effects often resemble menopause symptoms. Hot flashes, night sweats, vaginal dryness, mood changes, and aching joints or muscles are commonly reported. Many people find these effects ease over time or come and go.
Some hormone therapy medicines can thin the bones over time, so your team may arrange bone density scans and talk about calcium, vitamin D, and weight bearing exercise. Looking after your heart matters too, with regular checks of blood pressure and cholesterol as advised. Mention any new symptom, however small it seems, at your follow up visits.
Sticking With Treatment and Talking About Problems Early
Taking a daily tablet for years can feel like a long road, especially when you feel well and treatment feels like a reminder of cancer. It can help to build the tablet into a steady routine, such as with breakfast, and to keep a simple note of any side effects and when they happen.
If side effects are wearing you down, raise them early rather than quietly stopping. Teams are used to these conversations, and there are often ways to help, from simple measures for hot flashes to switching medicine groups. Staying on treatment gives it the best chance to protect you over the years ahead.
Frequently Asked Questions
Is hormone therapy the same as hormone replacement therapy?
No, they work in opposite directions. Hormone therapy for breast cancer lowers estrogen levels or blocks its effects to slow the cancer. Hormone replacement therapy adds hormones to ease menopause symptoms, and it is usually avoided after a hormone receptor positive breast cancer.
Will I need chemotherapy as well as hormone therapy?
Some people do, and some do not. It depends on the size and grade of the cancer, whether lymph nodes are involved, the results of receptor tests, and sometimes genomic tests on the tumor. Your team will explain the reasons behind the plan they recommend for you.
What happens if I miss a dose?
Missing an occasional tablet is common and is not usually a cause for worry. Most advice is simply to carry on with the next tablet as usual rather than doubling up, but check the guidance that comes with your own medicine, or ask your team or pharmacist if it happens often.
A Note on Medical Information
The information on this website is for general educational purposes only and is not medical advice. It does not replace the advice, diagnosis, or treatment of a qualified healthcare professional. If you notice a change in your breast or have concerns about your health, please contact a healthcare professional promptly.