Metastatic breast cancer can sometimes spread beyond the breast to the bones.
When breast cancer spreads to other organs in the body, it’s called metastatic breast cancer. This includes stage IV breast cancer. In the bones, metastatic breast cancer is called bone metastasis, or bone mets.
It’s possible for breast cancer to spread to any bone in the body, but the spine, hips, shoulders, skull, and upper parts of the leg bones near the hips are where it’s most often found. Bone metastasis can lead to weak bones, pain, and a higher risk of fractures. We know the idea of weak, easily broken bones can sound scary. But there are ways to manage bone issues and to protect the bones from some damage.
It’s also important to know that if you’re diagnosed with metastasis to the bone, you can still have an active life that includes exercise. Whether you’re an athlete or you’re new to exercise, you can work with your care team and a physical therapist to create fitness routines that meet your needs and remains safe for your bones.
It’s possible to have bone metastases and metastases in one or more other organs at the same time. Doctors refer to this as “multiple metastasis.” If you have metastases in more than one part of the body, your healthcare team will work to treat the cancer in all sites.
Often, the first signs that breast cancer has spread to your bones are aches and pains that are strong and unexplained. These pains can be caused by the metastases themselves, or by a bone break or fracture.
For many people, any unexpected symptom after a cancer diagnosis can trigger fear and anxiety. This is completely understandable, and if this is you, you’re not alone. Knowing that aches and pains are a major symptom of bone metastases may add to this stress, because everyone — cancer or not — has aches and pains from time to time.
It can be hard to know when a new ache is cancer-related. These symptoms may not immediately seem like cancer because there are many health issues that cause aches and pains, including menopause, breast cancer treatments such as aromatase inhibitors, or diseases like arthritis. And there are many ways to break or fracture even the strongest bones. The most important thing for you to do is to let your doctors know if you’re feeling something out of the ordinary so that they can reassure you, or order tests to look into symptoms you experience.
A serious, though rare, complication of bone metastasis is spinal cord compression. In spinal cord compression, a dangerous amount of pressure is put on the spinal cord, a column of nerve tissue that sends signals from the brain to the muscles. Symptoms can include:
Spinal cord compression can be very painful, affect your height and posture, and if not treated can sometimes lead to paralysis. Although spinal cord compression is not common, it is a medical emergency typically treated with radiation therapy, and sometimes also surgery. It’s important to call your doctor right away if you experience these symptoms.
If you have a history of breast cancer, even if it was years ago, report any bone pain that lasts two weeks or more to your healthcare team. This includes pain that makes you feel the need to see a chiropractor. Your care team can help determine whether you’re experiencing metastatic breast cancer symptoms, side effects related to breast cancer treatment, or something else.
Bone metastases are areas of cancer that develop when breast cancer cells travel to the bones. The tumors that develop, sometimes called lesions, can:
It’s common for people to have lytic and blastic lesions at the same time. Doctors use imaging tests, such as x-rays, to figure out the types of bone lesions a person might have. For lytic lesions, treatment may include bone-strengthening medicines called bisphosphonates. Blastic lesions can be treated with radioactive material injected into a vein, called radiopharmaceuticals. Radiopharmaceuticals can travel to bone metastases and destroy cancer cells.
Anyone diagnosed with breast cancer can develop bone metastases. For many people with metastatic breast cancer, the bones are the first location of cancer spread. In fact, almost 70% of people with metastatic breast cancer develop bone metastases at some point.
People diagnosed with estrogen receptor-positive metastatic breast cancer are more likely to have bone metastases than people with other subtypes of metastatic breast cancer. But so far, there is no evidence that people of certain ages or ethnicities are more likely to have cancer spread to the bone than others.
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Most cases of metastatic breast cancer to the bones are diagnosed after a person tells their doctor about bone-related symptoms. Others are diagnosed when a routine follow-up test shows abnormal results. If a doctor thinks you may have bone metastases, they will order one or more tests to confirm the diagnosis.
Doctors use imaging tests to create pictures of the bones and learn whether cancer has spread to them. These tests include:
Your doctor may also order a blood chemistry test to check for changes in your blood. These tests look for high levels of the mineral calcium and high levels of the enzyme alkaline phosphatase. We all need calcium and alkaline phosphatase, but too much of either in the blood could mean tumors in the bones are causing these substances to break down and get into the bloodstream.
It is important to know that bone density tests (sometimes called DEXA scans), which are frequently ordered in patients with early breast cancer to monitor the effects of hormonal medications on bone strength, do not detect bone metastases.
Sometimes, doctors diagnose bone mets by performing a bone biopsy, performed using a needle to remove a tiny piece of bone and test it for cancer cells. If you have just one suspicious area in the bones, or if it’s been many years since you were diagnosed with early-stage breast cancer, your doctor is more likely to recommend a bone biopsy.
Bone metastases and their symptoms are typically treated with systemic treatments that treat cancer cells no matter where they are in the body. These include:
In addition to these standard treatments, doctors may recommend these systemic bone-modifying medicines:
It’s also possible to treat bone metastases locally, in the specific places where cancer cells are found. Local therapies target cancer cells at the site of the metastasis, rather than treating cancer cells all over the body. For metastatic breast cancer in the bones, these are:
A diagnosis of breast cancer metastasis can trigger many different, and intense, feelings of uncertainty. It’s absolutely normal to wonder how long treatments may work, and you are not alone if you find yourself in this space. Many people living with a cancer diagnosis look for information about prognosis, the likely outcome or course of disease.
Right now, it’s not possible to predict how long one person with bone metastases might live compared to another. The most recent survival statistics available are not an accurate reflection of how long people are living today. Tracking and compiling survival data takes time, and during that time, new and more effective treatments become available.
Figuring out life expectancy also means looking at breast cancer subtype, how responsive the cancer is to treatment, your health before cancer, and current lifestyle choices, such as smoking and nutritional habits. What we do know is that people living with metastatic breast cancer are living longer.
If you’re curious about your own situation and believe knowing more will help you, talk with your care team. You can also learn more about life expectancy on our MBC prognosis page.
The first step to living well with metastatic breast cancer is to get standard-of-care systemic treatments, such as hormonal therapy, chemotherapy, and targeted therapy. These treatments work to keep the cancer from growing more or traveling further in the body. Treatments specific to bone metastases, such as surgery, radiation, and bone-modifying medicines, are the best next step, because they can help reduce side effects and maintain your quality of life.
Once there is a clear diagnosis of bone metastases, you and your doctors will decide on a treatment plan. Part of that plan will involve tests that show how well treatment is working and how strong your bones are. These tests can show whether the bone metastases are growing, spreading, or staying the same, so you and your doctor can continue making treatment decisions and manage side effects.
We know that it can feel frightening to think about the possibility of weaker bones or bone pain. It can mean changing your routine or avoiding activities you’re used to. But there are always adjustments that can be made to allow you to live a life that is active and fulfilling in many different ways.
Your care team will monitor the bone metastases regularly to control the cancer and to help you figure out what your body can handle as you have treatment. Your doctors may use some of the same tests to monitor bone metastases that were used to diagnose them. This will likely include imaging tests that create pictures of your bones, such as x-rays, CT scans, MRIs, PET scans, and bone scans.
By comparing the pictures over time, your doctors can see if tumors in the bones are growing, shrinking, or changing in other ways in response to treatment. The images will also show doctors how strong your bones are, and whether a bone is at risk of breaking. If a fracture risk is found, they can recommend treatments that reduce the risk.
Your doctors may also order blood tests to monitor bone metastases:
How often you get which tests depends on your diagnosis and your doctor’s preferences. But it’s common for doctors to recommend imaging tests in patients with metastatic breast cancer every 2-6 months to assess for bone metastases. If they recommend blood tests, a common schedule for tumor marker tests is every 1-3 months. Blood chemistry tests are commonly done every 1-3 months.
Your doctor may also recommend additional tests if you experience bone-related symptoms or side effects. You can always ask your doctor about why different tests are recommended at certain times.
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Living Beyond Breast Cancer is a national nonprofit organization that seeks to create a world that understands there is more than one way to have breast cancer. To fulfill its mission of providing trusted information and a community of support to those impacted by the disease, Living Beyond Breast Cancer offers on-demand emotional, practical, and evidence-based content. For over 30 years, the organization has remained committed to creating a culture of acceptance — where sharing the diversity of the lived experience of breast cancer fosters self-advocacy and hope. For more information, learn more about our programs and services.
