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Temple researchers show targeted cancer drug may stunt heart's ability to repair itself
Date:11/6/2012

(Philadelphia, PA) Scientists for the first time have evidence showing how a widely used type of "targeted" cancer drug can be dangerous to the heart.

Studying mice with the equivalent of a heart attack, researchers found that the drug sorafenib (Nexavar) which inhibits proteins called tyrosine kinase receptors (RTKs), and is used in kidney and liver cancer treatment can interfere with heart stem cell activity, affecting the heart's ability to repair itself after injury. The findings suggest that sorafenib and other similar drugs that target these kinds of protein receptors may raise the risk for heart attack for some cancer patients with underlying heart disease, as well as affect the heart's ability to repair damage. By understanding how these cancer drugs can affect the heart, scientists and clinicians may be able to devise new treatment strategies to lessen such potentially damaging effects of often vital cancer drugs.

"The goal is not to take the drug off of the market it's a very good and useful drug that cancer patients need. We're trying to understand how this cancer drug and others like it can affect the heart, and what types of individuals might be at risk for problems," said senior author Steven Houser, PhD, Professor and Chair of Physiology at Temple University School of Medicine and Director of Temple's Cardiovascular Research Center. "Our results are beginning to provide a clearer picture of some of the potential physiological mechanisms at play."

Dr. Houser, first author Catherine Makarewich, a graduate student, and their co-workers reported their findings November 5, 2012 at the Late-Breaking Basic Science Session at the American Heart Association's Scientific Sessions in Los Angeles.

Sorafenib is a member of a broad class of anticancer drugs called targeted therapies that halt cancer growth, rather than necessarily trying to eliminate the disease. Termed a "multi-kinase" inhibitor, sorafenib blocks t
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Contact: Steven Benowitz
steven.benowitz@tuhs.temple.edu
215-707-4784
Temple University Health System
Source:Eurekalert

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