The stage of breast cancer when cancer cells do not remain in the original cancer site and spread out to other parts of the body is called metastatic breast cancer. This is the stage when the cancer is fully advanced. Even if you have been successfully treated for breast cancer, there is a chance that some cancer cells do not die, and later spread out through blood and lymphatic vessels to other body organs. This process is known as metastasis of breast cancer.

Metastatic breast cancer can either recur, that is, the treatment for breast cancer may have completed, but the cancer cells that escaped from being killed make the cancer recur, or may happen during the course of treatment, when the cancer is so aggressive that it spreads out despite of the treatments, or, in some cases when diagnosis is very late, and the cancer has spread out, metastatic might be the very first diagnosis.

When breast cancer recurs, the breasts, bones, lungs, chest wall, liver and/or brain start developing it, and show changes. Breast cancer has the highest risk of spreading. If another kind of cancer develops after breast cancer has been treated, it is probably breast cancer recurring. This is good news, because breast cancer is more treatable than any other kind of cancer. Also, if the cancer comes back in the breast that was not diseased earlier, it is probably a new cancer, and not a recurrence.

It is very important to know about metastatic breast cancer because around 30% of women with breast cancer are later diagnosed with metastatic cancer. Metastatic breast cancer is best treatable when no organ, specifically the lungs and brain, develop cancer, or when the cancer cells show traces of estrogen or progesterone hormone receptors, or, when tumors still respond to therapies, or when there have not been many treatments the patient has already availed.

Since a total cure of metastatic disease is very difficult, the treatment involved is very long and cumbersome. A combination of Systemic therapy and regular monitoring is needed. This involves chemotherapy, hormonal treatment and radiation therapy, and for monitoring, regular mammograms, breast ultrasounds, CT scans, MRIs, PET scans, bone scans are done. Treatment also varies with purpose, chemo and radiation therapies concentrating on the whole body cure, surgeries like lumpectomy and mastectomy on specific body parts, and oral aspirin intake along with other drugs focusing on lessening physical pain of the victim.

A lot of research is going into slowing down and completely stopping further advancement of metastatic breast cancer. Even though this is the worst phase of your cancer, it is important that you know that many women with the metastatic disease have lived happily and normally while taking their treatment. You will have to decide when to end your treatment, for the higher the number of treatments you take, the higher the side-effects. This decision is the hardest to take, but you will know you have tried everything, prolonged your life as much as you could have. Spend the rest of your life being happy, and taking regular medication. Happiness is known for prolonging life, too.