What Is Breast Cancer?

Breast cancer is a disease in which malignant (cancer) cells form in the tissues of the breast. The damaged cells can invade surrounding tissue, but with early detection and treatment, most people continue a normal life.

  • One in eight women will be diagnosed with breast cancer in their lifetime.
  • Breast cancer is the most commonly diagnosed cancer in women.
  • Breast cancer is the second leading cause of death among women.
  • Each year it is estimated that over 220,000 women in the United States will be diagnosed with breast cancer and more than 40,000 will die.
  • Although breast cancer in men is rare, an estimated 2,150 men will be diagnosed with breast cancer and approximately 410 will die each year.