How long do breast cancer spread if not treated?

It depends...: I assume you're asking how long it takes before breast cancer begins to spread when not treated. That's a good question. It depends on many factors such as the type of breast cancer and how aggressively the cancer behaves. There is tremendous variation which ranges anywhere from a month to many years. I hope this helps.

Breast cancer: Breast cancer should be evaluated by mammogram, us and biopsy. With this information the type of breast cancer, the cellular activity and hormonal receptor status can be evaluated which aid your breast surgeon, medical oncologist and radiation oncologist guide you through the process. If you need a mastectomy a plastic surgeon with breast reconstruction experience should be consulted.

They keep on spreadi: Breast cancer remains localized to the breast for a finite, yet unpredictable period of time before they begin to spread, first to the regional lymph nodes in the armpit and later into the internal organs of the body. Once cancer begins to spread(metastasize), they keep spreading unchecked unless you receive treatment with chemotherapy or hormonal therapy which could kill the spread cancer cells.