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Possible location of lung cancer genes found

Researchers at Dana-Farber Cancer Institute and collaborating institutions have found sections of the // chromosomes of lung cancer cells where cancer-related genes may lurk.

In a study in the July 1 issue of the journal Cancer Research, the researchers used single nucleotide polymorphism (SNP) array technology, which focuses on the building blocks of individual genes, to identify regions of chromosomes where genes were either left out or multiplied over and over – mistakes that are often associated with cancer. In this effort, SNP (pronounced "snip") arrays have been used to find gene-copy errors in lung cancer cells.

Senior author of the study Matthew Meyerson, MD, PhD, of Dana-Farber said:. "In a previous study, we showed that SNP arrays offer a unique way of locating copy-number changes in cell chromosomes and of determining when genes on a pair of chromosomes are mismatched. The current study demonstrates that high-resolution SNP technology is powerful enough to identify copy-number alterations that previously hadn't been found in lung cancer cells."

Working with 70 specimens of lung cancer tissue and 31 laboratory-grown lines of lung cancer cells, the investigators used high-resolution machinery to scan the cells' chromosomes in 115,000 locations. They found several areas that had already been identified as having copy-number errors, plus five new ones –– two where genes had been deleted, and three where they had been highly over-copied.

The next step will be to identify the specific genes involved in these alterations. That, in turn, could lead to new diagnostic tests and treatments for lung cancer, by far the most common form of cancer in the United States, and one of the most difficult to treat.

There is increasing evidence that therapies aimed at specific gene abnormalities can be effective in treating cancer. Last year, for example, Meyerson, demonstrated that the drug Iressa shrank tumors in
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