By Dr. Brian McDonoughSponsored By Independence Blue Cross

PHILADELPHIA (CBS) — Cancer is evil and it is not politically correct. In other words, it discriminates one race against another.

Some examples, according to experts: breast cancer discriminates. Colon cancer discriminates as well.

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In fact, it seems to spread faster in African Americans and research has helped reveal why.

Researchers from the University of North Carolina at Chapel Hill found, using a slightly different category of cancer called basal tumors and a relatively fast-growing one called triple negative, that these cancers do grow faster in African Americans.

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In fact, 15 percent of all breast cancers are among black women under 50.

The bottom line is there are genetic differences that could play a role in the disparity.

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Environmental factors also matter, but these studies show that screening is important.