Article Source: Health.com - CNN

(Health.com) -- I was 18 when I first felt a lump in my breast. Of course, I was convinced that I was going to die. This was three decades ago -- back when we knew far less about breast cancer. A general surgeon removed the lump, which, thank goodness, wasn't malignant.

Once identified only by how far the disease had advanced -- such as stage 0 or stage IV -- scientists now know that breast cancer is actually many diseases and that each tumor has a unique genetic fingerprint. There are luminal A and B, HER2 type, and triple negative, among others. That means physicians can more effectively target treatment with therapies that have the best chance of working.

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