美国癌症协会ACS：2022-2024年美国乳腺癌数据统计报告（英文版）

Breast cancer is a group of diseases in which cells in a person’s breast tissue change and divide uncontrolled, typically resulting in a lump or mass. Most breast cancers begin in the milk glands (lobules) or in the tubes (ducts) that connect the milk glands to the nipple. What are the signs and symptoms of breast cancer? Breast cancer typically has no symptoms when the tumor is small and most easily treated, which is why breast cancer screening is important for early detection. The most comm