Cancer Institute A national cancer institute
designated cancer center

What is Breast Cancer

Front view diagram of healthy breast
Front view diagram of healthy breast

Side view diagram of healthy breast
Side view diagram of healthy breast

According to the American Cancer Society, approximately 207,090 new cases of invasive breast cancer were diagnosed in women in 2010. After increasing for more than two decades, female breast cancer incidence rates decreased by about two percent per year from 1998 to 2007, likely due to the reduced use of hormone replacement therapies as well as improved prevention, detection and treatment efforts.

There are two primary types of breast cancer, non-invasive and invasive breast cancer:

Non-Invasive

Invasive Breast Cancer

Subtypes of invasive breast cancer include: 

Stanford Medicine Resources:

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