Stage 3 cancer means the breast cancer has extended to beyond the immediate region of the tumor and may have invaded nearby lymph nodes and muscles.
Many factors influence a person's life expectancy after a stage 3 breast cancer diagnosis, including age, sex, and response to treatment.
Most women with stages I, II, or III breast cancers are treated with surgery, often followed by radiation therapy. Many also get some kind of drug.
Stage III breast cancer is a more advanced form of invasive breast cancer. At this stage, the cancer cells have usually not spread to more distant sites in the body.
Understanding stage III breast cancer and its treatment options, from WebMD.