what is breast cancer?

Breast cancer is a disease in which malignant (cancer) cells form in the tissues of the breast. It is considered a heterogeneous disease, meaning that it is a different disease in different women, a different disease in different age groups and has different cell populations within the tumor itself. Generally, breast cancer is a much more aggressive disease in younger women.

Women in the United States get breast cancer more than any other type of cancer except for skin cancer. It is second only to lung cancer as a cause of cancer death in women.

This year it is estimated that nearly 200,000 women will be diagnosed with breast cancer and more than 40,000 will die. Breast cancer is not exclusively a disease of women, however. Approximately 1,700 men will be diagnosed with breast cancer and 450 will die each year. The evaluation of men with breast masses is similar to that in women, including mammography.

Symptoms

Generally, early breast cancer does not cause pain. Even so, a woman should see her health care provider about breast pain or any other symptom that does not go away.

Common symptoms of breast cancer include:

• A change in how the breast or nipple feels
  You may experience nipple tenderness or notice a lump or thickening in or near the breast or in the underarm area.
• A change in how the breast or nipple looks
  This could mean a change in the size or shape of the breast or a nipple that is turned slightly inward. In addition, the skin of the breast, areola or nipple may appear scaly, red or swollen or may have ridges or pitting that resembles the skin of an orange.
• Nipple discharge