Breast cancer primarily metastasizes to the bone, lungs, regional lymph nodes, liver and brain, with the most common site being the bone. Lymph node metastsasis into the sentinel node and few surrounding nodes is regarded as a treatable local event and not metastatic breast cancer, both when occurring at primary presentation or later.
Today, say the MD Anderson researchers, as many as 40% of women with recurrent or metastatic breast cancer survive at least five years. "More and more, both doctors and patients approach it as a chronic condition," says Eric Winer, MD, director of the Breast Program at Boston's Dana-Farber Cancer Institute. "We can't cure it, but we can manage it for many years."
For more information:http://www.webmd.com/breast-cancer/features/metastatic-breast-cancer-chronic-condition