🔄 NHS & WHO sourced

Secondary (Metastatic) Breast Cancer

Secondary breast cancer — also called metastatic or stage 4 — means cancer cells have spread to other parts of the body. It is not curable, but it is treatable.

Reviewed against NHS & WHO guidelines Last reviewed: January 2025 For educational purposes — not medical advice
✓ Secondary breast cancer cannot currently be cured, but it can be controlled
✓ The most common sites of spread are bones, liver, lungs and brain
✓ Modern treatments have significantly extended survival for many patients
✓ Palliative care focuses on quality of life, not just end of life

What is secondary breast cancer?

Secondary breast cancer (also called metastatic, advanced or Stage 4 breast cancer) is when breast cancer cells have spread from the primary tumour in the breast to other parts of the body. It is the same type of cancer — for example, a secondary tumour in the liver that started as breast cancer is still breast cancer, not liver cancer.

Where does it commonly spread?

  • Bones: The most common site of secondary breast cancer. Can cause pain, fractures, and spinal cord compression.
  • Liver: May cause nausea, jaundice, weight loss or no symptoms at all in early stages.
  • Lungs: Can cause breathlessness, cough or chest pain.
  • Brain: Headaches, seizures, visual changes or cognitive difficulties.

Treatment

Secondary breast cancer cannot currently be cured, but it can be treated — often for many years. The goal of treatment is to control the disease, manage symptoms, and maintain quality of life. Treatments may include hormone therapies, targeted therapies, chemotherapy, radiotherapy (particularly for bone or brain metastases), and bisphosphonates (to protect bones).

New treatments are constantly being developed. CDK4/6 inhibitors, PARP inhibitors, antibody-drug conjugates (such as trastuzumab deruxtecan), and immunotherapy have all significantly extended survival for some patients in recent years.

Living with secondary breast cancer

Many people with secondary breast cancer live active, fulfilling lives for years after diagnosis. Palliative care — which is about quality of life, not end of life — plays an important role in managing symptoms and supporting wellbeing. Specialist nurses, psychological support, and peer connections are vital.

Frequently asked questions

What is secondary breast cancer? +
Secondary breast cancer (also called metastatic or Stage 4 breast cancer) is when breast cancer cells have spread from the original tumour to other parts of the body — most commonly the bones, liver, lungs or brain. It is the same cancer as the primary, not a new one. Secondary breast cancer cannot currently be cured, but it can often be treated and controlled for months or years.
What are the symptoms of breast cancer spreading to bones? +
Breast cancer that has spread to the bones often causes persistent bone pain — particularly in the back, hips or ribs — that does not improve with rest. Other signs include unexpected fractures, spinal cord compression symptoms (weakness or numbness in legs), or high calcium levels causing fatigue and confusion. Any persistent, unexplained bone pain warrants medical assessment.
Can secondary breast cancer go into remission? +
Secondary breast cancer cannot be cured, but treatment can reduce or control it. Some patients achieve a partial or complete response to treatment, where scans show no detectable disease. However, this is not the same as being cancer-free — the cancer remains and is monitored closely. The goal of treatment is to control the disease and maintain quality of life for as long as possible.

Clinical sources

  • NHS — www.nhs.uk
  • World Health Organization — www.who.int

This content is for educational purposes and does not constitute medical advice. Always consult a qualified healthcare professional for personal medical guidance.

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