Understanding the Treatment Options for Stage IV Breast Cancer
There are 4 stages of breast cancer—stage I, II, III, and IV. Stage IV breast cancer is also known as metastatic or even secondary breast cancer and is the most advanced stage of breast cancer. If left untreated for a long time, then cancer metastasizes (spreads) beyond the breast. Most often, metastatic breast cancer spreads through the lymphatic system to the liver, bones, lungs, and brain.