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Cancer therapy based on anatomical location may soon be obsolete

The results of a new study at Washington University School of Medicine in St. Louis could eventually have oncologists removing their specialties from their shingles by making therapy based on a tumor's anatomical location obsolete.

When the researchers compared eight different kinds of cancerous tumors, they saw that whether the tumor was, for instance, a breast tumor, lung tumor or colon tumor didn't correlate to how the cancers interacted with a standard anticancer drug.

Their findings suggest that traditional cancer treatments -- which have established different drug regimens for brain, prostate or ovarian cancer, for example -- should eventually be replaced with therapies that use drugs deemed to be of highest benefit based on the tumor's pharmacologic profile. Treatment choice would be determined by how each patient's tumor reacts to anticancer drugs, regardless of the tumor's anatomical origin.

"This study is the first time the pathway for a drug's effect has been analyzed in tumors from different anatomical locations," says Howard McLeod, Pharm.D., director of the pharmacology core at the Siteman Cancer Center and a member of the National Institutes of Health (NIH) Pharmacogenetics Research Network. "We've shown that drug effect is independent of where the tumor came from in the body. If further studies confirm that a tumor-specific approach is better than the current anatomical emphasis, oncologists may have to stop thinking of themselves as colon cancer or breast cancer specialists and let the cancer tell them which drugs to use for each specific patient."

The research team analyzed 255 samples of eight different cancers -- colon, breast, prostate, ovary, lung, brain, melanoma and lymphoma -- and measured the amounts of specific proteins known to influence the effect of irinotecan, a commonly used anticancer agent. Their study will appear in an upcoming issue of the Journal of Pathology.

The protein levels that determ
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Contact: Gwen Ericson
ericsong@wustl.edu
314-286-0141
Washington University School of Medicine
19-Apr-2006


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