Breast cancer is the most common cancer inin-si women in the United States, aside from skin cancer. According to the American Cancer Society (ACS), an estimated 182,460 new cases of invasive breast cancer were 
expected to be diagnosed among women in the United States last year. An estimated 40,480 women were expected to die from the disease in 2008 alone. Today, there are about 2.5 million breast cancer survivors living in the United States.
If you’re worried about developing breast cancer, or if you know someone who has been diagnosed with the disease, one way to deal with your concerns is to get as much information as possible. In this section you’ll find important background information about what breast cancer is and how it develops.
Breast cancer is a malignant tumor that grows in one or both of the breasts. Breast cancer usually develops in the ducts or lobules, also known as the milk-producing areas of the breast.
Breast cancer is the second leading cause of cancer death in women (after lung cancer). Although African-American women have a slightly lower incidence of breast cancer after age 40 than Caucasian women, they have a slightly higher incidence rate of breast cancer before age 40. However, African-American women are more likely to die from breast cancer at every age. Breast cancer is much less common in males; by comparison, the disease is about 100 times more common among women. According to the American Cancer Society, an estimated 1,990 new cases of invasive breast cancer were expected to be diagnosed among men in the United States in 2008.
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