What is breast cancer? Breast cancer is a disease in which abnormal cells in the breast grow and invade healthy cells. Breast cancer is the most common type of cancer found in women in the U.S. While many women with early-stage breast cancer are successfully treated, approximately 1 in 10 are diagnosed with metastatic breast cancer (MBC), and 20 percent to 30 percent of … [Read more...] about Understanding metastatic breast cancer in black women; risks, disparities, and hope