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Gene chip data improved therapy in some patients with incurable cancer
Date:9/19/2007

ATLANTA Like many oncologists, Eric P. Lester, M.D., was faced with a dilemma: seven patients with advanced, incurable cancer, an arsenal of drugs that may or may not help them, and not enough solid proof about treatment efficacy to guide him. So Dr. Lester devised what he called a simple-minded experiment that illustrates the promise of personalized medicine. Using DNA microarray chips, Dr. Lester analyzed his patients tumors for expression of genes associated with good response to various anti-cancer drugs, and based his drug treatment plans on the results. Four out of seven patients with advanced cancer enrolled in the extremely limited study had a better outcome than expected.

The finding, presented today in Atlanta, Ga. at the American Association for Cancer Researchs second International Conference on Molecular Diagnostics in Cancer Therapeutic Development, shows that a personalized molecular oncology approach, basing chemotherapy on relative gene expression in tumors, holds promise even at the relatively crude level employed here, said study investigator, Dr. Lester, president of Oncology Care Associates in St. Joseph, Mich.

To obtain and analyze chip data, Dr. Lester worked with Craig Webb, Ph.D., Director of Translational Medicine at the Van Andel Research Institute in Grand Rapids, Mich.

The study is unusual because oncologists dont yet base most of their treatment decisions on gene profiling, especially when it might involve pairing drugs together in a novel combination or using varied doses, Dr. Lester said. Much of clinical medicine is an educated guess, and this was an attempt to come up with a better approach by using the technology of a gene chip to make multiple, highly educated guesses simultaneously, Dr. Lester said.

Dr. Lester added that one of the seven participating patients died before the gene chip was used to direct therapy.

Many current clinical trials involving gene expression examine eff
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Contact: Greg Lester
lester@aacr.org
267-646-0554
American Association for Cancer Research
Source:Eurekalert

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