Metastatic breast cancer, also known as stage IV breast cancer, is breast cancer that has spread to distant parts of the body. It may affect the bones, liver, lungs or brain, among other sites. Treatment at this stage is usually aimed at controlling the cancer, easing symptoms and helping a person live as well and as long as possible. While it is generally not considered curable, many people live with metastatic breast cancer for years with treatment.

Treatment plans vary from person to person. A doctor looks at what type of breast cancer it is, where it has spread, which treatments have already been tried and how the person is doing overall. Testing the tumour can provide some of the most important clues.

Why Does The Type Of Breast Cancer Matter?

Breast cancer is not one single disease. Some breast cancer cells depend on hormones such as oestrogen or progesterone to grow. Others have increased amounts of a protein called human epidermal growth factor receptor 2 (HER2), which can encourage cancer cells to grow. This is why doctors usually check hormone receptors and HER2 status when planning treatment for metastatic disease. Other tests may also look for specific genetic or molecular changes in the cancer.

For hormone receptor-positive breast cancer, hormone therapy is often an important part of treatment. Medicines such as tamoxifen, fulvestrant, and aromatase inhibitors, including anastrozole, letrozole, and exemestane, reduce the effect of hormones on cancer cells.

Key takeaways

  • Treatment for Metastatic breast cancer focuses on controlling the cancer, managing symptoms and maintaining quality of life.
  • Treatment depends on- hormone receptor status, HER2 status, biomarker findings, previous treatments and overall health.
  • Hormone therapy, targeted therapies, chemotherapy, immunotherapy and antibody-drug conjugates may all have a role in treatment, depending on the type of cancer.
  • Supportive and palliative care can be used alongside cancer treatment to help manage symptoms and improve quality of life. 

What If The Cancer Is HER2-Positive?

HER2-positive breast cancer has higher-than-normal amounts of the HER2 protein. Instead of relying only on chemotherapy, doctors can use medicines that specifically target this protein.

Trastuzumab is one of the best-known examples. It is a monoclonal antibody, a medicine designed to recognise and attach to a particular target. Ujvira 100 mg is a trastuzumab emtansine injection used to treat certain HER2-positive cancers. Antibody-drug conjugates (ADCs) are also available. These medicines combine an antibody with a cancer-killing medicine.

The choice between these treatments depends on the individual situation. If the cancer progresses, the treatment may be changed rather than continued indefinitely.

Treating Triple-Negative Breast Cancer

Triple-negative breast cancer is different because its cells do not have oestrogen or progesterone receptors and do not have high levels of HER2. This means that hormone therapy and conventional HER2-targeted treatment are not options. Chemotherapy remains an important treatment for this type of metastatic breast cancer. For some patients, doctors may add immunotherapy.

Immunotherapy uses medicines that help the immune system recognise and attack cancer cells. Pembrolizumab is used in certain breast cancer settings, including some patients with advanced or metastatic triple-negative disease. Another group of medicines that has changed treatment for advanced breast cancer is antibody-drug conjugates.

Where Does Chemotherapy Fit In?

Chemotherapy has not disappeared from metastatic breast cancer treatment. It remains useful, particularly when the cancer is growing quickly, when other treatments no longer control it, or when a rapid response is needed.

Doctors choose among several chemotherapy medicines based on the type of cancer, previous treatments, and the person’s general health. Sometimes doctors use one chemotherapy medicine at a time rather than combining several. This can reduce treatment-related side effects while still providing cancer control in some situations.

Supportive Care Is Part Of Treatment

Controlling the cancer is important, but so is dealing with what the cancer or its treatment is doing to everyday life. Pain, tiredness, nausea, breathlessness and other symptoms may need treatment of their own. Radiation therapy can sometimes help control pain from cancer that has spread to the bones, for example. Surgery may also be considered in selected situations.

Palliative care can be introduced alongside cancer treatment. It focuses on symptoms, comfort and quality of life. Choosing palliative care does not necessarily mean that cancer-directed treatment has stopped.

Conclusion

There is no single “best” treatment for every person with metastatic breast cancer. The cancer may respond to a treatment for a period and later become resistant. When that happens, doctors can re-evaluate the available options. This is also why biomarker testing, previous treatment history and regular follow-up matter. The treatment that makes sense at one point may not be the same treatment that makes sense several months or years later.

The aim is not only to control the cancer but also to help a person feel as well as possible throughout treatment. Staying in regular contact with the oncology team, discussing new symptoms, and understanding why a particular treatment has been recommended can help patients make informed decisions about their care.

Disclaimer: The content in this blog is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a registered dietitian before making any changes to your medicines or diet.