Oct 11, 2021 · Explanations about what cancer is, how cancer cells differ from normal cells, and genetic changes that cause cancer to grow and spread.

Accurate, up-to-date, comprehensive cancer information from the U.S. government's principal agency for cancer research.

Dec 2, 2025 · Learn about causes of breast cancer and factors that increase risk, such as your health history, genetics, and certain behaviors.

Dec 2, 2025 · Learn about tests used to diagnose and stage breast cancer, including imaging tests, biopsies, and multigene tests.

Dec 2, 2025 · There are many different types of breast cancer. Learn more about each one and access in-depth information for the most common types.

The Annual Report to the Nation on the Status of Cancer is an update of rates for new cases and deaths as well as trends for the most common cancers in the United States.

Dec 2, 2025 · Breast cancer happens when cells in the breast grow without control, creating a mass called a tumor that may spread elsewhere in the body. Breast cancer mostly affects …

TNM staging describes tumor size and the extent of spread of the cancer. Learn about each TNM category and what TNM staging tells you about your breast cancer.

Dec 2, 2025 · Learn about tests for breast cancer biomarkers, such as hormone receptors and HER2, and how results of these tests can help plan treatment.

May 14, 2025 · There is some evidence that inherited cancer-related genetic changes, often called germline mutations, may bear some responsibility for the growing number of early-onset …