Breast Cancer Pictures Slideshow (cont.)

HER-2 is a protein that is expressed at a high level by about 20% of breast cancers. This is known as having HER-2-positive cancer. Having this receptor means the cancer tends to grow and spread faster than other forms of breast cancer, but there are special treatments available for this type of tumor. The image shows molecular detection of the HER-2 receptor in a breast cancer cell.

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