What causes metastatic breast cancer?
We still do not understand why some cancers become metastatic, especially those that are diagnosed years after the first breast cancer. In the past, doctors believed that cancer progressed in a linear manner and that women with positive lymph nodes were more likely to become metastatic. Now researchers are focusing more on genetics and the microbiology of breast cancer. They are trying to learn why some cancers behave more aggressively, what causes cancer cells to grow in different parts of the body, and what treatments can be developed to stop that process.
