Stage 4 breast cancer means that the cancer has spread to other parts of the body.
It is also called advanced cancer, secondary breast cancer, or metastatic breast cancer.
In stage 4 breast cancer:
- the tumour can be any size
- the lymph nodes may or may not contain cancer cells
- the cancer has spread (metastasised) to other parts of the body such as the bones, lungs, liver or brain
The TNM staging system stands for Tumour, Node, Metastasis.
- T describes the size of the tumour
- N describes whether there are any cancer cells in the lymph nodes
- M describes whether the cancer has spread to a different part of the body
In the TNM staging system stage 4 breast cancer is the same as:
- Any T Any N M1
Your specialist will take a number of different factors into account when deciding which treatment is best for you, including:
- which part of your body the cancer has spread to
- the treatment you have already had
- your general health
- whether you have had your menopause
- whether the cancer is growing slowly or more quickly
- whether the cancer cells have receptors for particular types of drug treatment
Secondary breast cancer may respond to several types of treatment. Doctors try to start with treatment that has as few side effects as possible.
Remember that treatment can often keep secondary breast cancer under control for many months or years.
Types of treatment
Hormone therapy is a common treatment for secondary breast cancer. It can often shrink and control the cancer wherever it is in the body. It works well if the cancer cells have particular proteins called hormone receptors.
If one hormone therapy stops working so well, another might then help.
Your specialist might suggest chemotherapy if your cancer doesn't have hormone receptors or has spread to the liver or lungs.
You might have treatment with a targeted cancer drug such as the monoclonal antibody trastuzumab (Herceptin). Herceptin targets and blocks a protein that stimulates breast cancer cells to grow and multiply. It only works if your breast cancer cells make too much of a protein called HER2.
You may have a type of targeted drug called a cancer growth blocker. They block the proteins which tell the cell to grow and divide. These can become overactive when there are too many hormone receptors.
An example of this is a drug called palbociclib. It can help to control the growth of breast cancer cells and slow it down. This is for advanced and locally advanced breast cancers that are oestrogen positive and HER2 negative.
You might have radiotherapy if the cancer has spread to:
- the bones
- the brain
- the skin near the breast or on the mastectomy scar
Bone strengthening treatment
Another treatment you may have if your cancer has spread to the bones is bone strengthening therapy. This includes a group of drugs called bisphosphonates and a targeted drug called denosumab. This treatment may also help to reduce pain.
Surgery is not usually an option for treating advanced breast cancer. In some situations surgery can help to relieve symptoms.
Your doctor or nurse can prescribe medicines to control symptoms that the cancer causes. The symptoms will depend on where the cancer has spread to. They might include a cough, constipation, sickness, or high blood calcium levels, for example.
Making decisions about treatment
Deciding about treatment can be difficult. Treatments can help to reduce symptoms and might make you feel better. But they also have side effects that can make you feel unwell for a while. Find out about making decisions when you have advanced cancer.
More information about advanced cancer
Information can help you to understand your situation.