Breast cancer affects one in every eight American woman. If detected and treated early, it is highly curable.
- Breast cancer develops when cells in the breast divide and grow without their normal controls. Cancer cells also don’t organize normally. Instead they grow into a tumor, which may invade nearby tissue and spread to other organs.
- In the United States, breast cancer is the second most common cancer in women (after skin cancer). About 319,000 people are newly diagnosed with breast cancer each year.
- Over a woman’s lifetime, there’s a one in eight chance she will get breast cancer. For men, the lifetime risk is much lower—about one in 1,000.
- The content in this section is mainly aimed at women, who make up 99 percent of all breast cancer patients. Most of the information applies to men as well.