By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – We know that many forms of breast cancer are linked to genetic factors.

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The BRCA gene is the classic example and recognizing the presence of the gene is a test that can help with early life saving diagnosis. But as we learn more about genetic testing we are learning that there is more to test for.

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There are many potential genetic links to diseases like breast cancer.

For instance a new report in the journal Nature finds that there may be a reason why certain forms of breast cancer respond to different treatments. In the first study of what are called primary triple-negative breast cancers, which represent approximately 16% of all breast cancers, it was found there is definitely widespread genetic differences within this breast cancer subtype that may underlie the varied responses to therapies.

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This is important to understand because it can help lead to more effective treatments.