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Common pain relief medication may encourage cancer growth
Date:11/18/2009

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In the other study, using Lewis lung carcinoma cells, mice without the mu opiate receptor did not develop the tumors that normal mice did when injected with cancer cells. The researchers further showed that MNTX reduced proliferation of cancer cells by 90 percent in normal mice. It also prevented invasion in cell culture and tumor growth and metastasis in mice.

The opioid receptor promotes Lewis lung cancer tumor growth, angiogenesis and metastasis, the authors conclude in a summary of the second study. "Methylnaltrexone attenuates these oncogenic effects."

"In conjunction with previous studies on opiate-induced angiogenesis by our laboratory and others, these experimental data suggest a plausible explanation for the epidemiologic observations," notes Moss, professor of anesthesiology and critical care at the University of Chicago. "If these laboratory studies are confirmed clinically, the selection of anesthetic technique used during the operative procedure and the possible use of opiate antagonists in the perioperative period may be important."


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Contact: John Easton
john.easton@uchospitals.edu
773-702-6241
University of Chicago Medical Center
Source:Eurekalert

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