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SNPs of ABC transporter genes linked to lung cancer risk
Date:12/21/2008

Individuals with particular variants of certain genes involved in metabolizing the most potent carcinogen found in cigarette smoke have an increased risk of developing lung cancer. That is the conclusion of a new study published in the February 1, 2009 issue of CANCER, a peer-reviewed journal of the American Cancer Society. The study's results may help shed light on how lung cancer develops and could have important implications for preventing smoking-related cancers.

Tobacco-specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) is a component of cigarette smoke that has been shown to cause lung cancer in rodents. Certain enzymes act to protect the body from this type of chemical by turning it into nontoxic forms or by transporting it from cells. For example, ATP-binding cassette transporters encoded by genes known as ABCB1 and ABCC1 are involved in eliminating carcinogens from the lungs, protecting them against inhaled toxins.

Researchers suspect that individuals with alterations in these genes might have an increased susceptibility to develop lung cancer. Recently, a team of scientists led by Dr. Daru Lu and Dr. Haijian Wang of the Fudan University in Shanghai identified common variants at the beginning and end of the ABC1 and ABCC1 genes. They then analyzed these variants in 500 patients with lung cancer and 517 cancer-free controls in a Chinese population.

The investigators found that certain variants were found much more often in individuals with lung cancer than in cancer-free controls. Patients who had the variant allele of either ABCB1 rs3842 or ABCC1 rs212090 had a significantly increased risk of developing lung cancer. The former variant was particularly associated with an increased risk of cancer in women and in individuals under age 60 years. It also was linked to a major type of lung cancer called adenocarcinoma.

Dr. Wang and his colleagues previously identified other common genetic vari
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Contact: David Sampson
david.sampson@cancer.org
American Cancer Society
Source:Eurekalert

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