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1 Occupational Health Program, Departments of Environmental Health and 2 Biostatistics, Harvard School of Public Health, Boston, Massachusetts; 3 Thoracic Surgery Unit, Departments of Surgery and 4 Hematology-Oncology, and 5 Pulmonary and Critical Care Unit, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
Requests for reprints: David C. Christiani, Harvard School of Public Health, 665 Huntington Avenue, Boston, MA 02115. Tel: 617-432-3323; Fax: 617-432-6981. E-mail: dchristi{at}hsph.harvard.edu
Extracellular matrix-degrading matrix metalloproteinase-1 (MMP-1) is an interstitial collagenase that degrades the interstitial types I, II, and III collagens, and overexpression of MMP-1 is associated with cancer development and cellular invasion. The 2G allele of the MMP-1 –1607 1G/2G polymorphism is associated with enhanced transcriptional activity. We investigated the association between the MMP-1 1G/2G polymorphism and lung cancer risk in 1,752 Caucasian lung cancer patients and 1,363 healthy controls. There were no overall associations between the MMP-1 genotypes and risk of lung cancer, with the adjusted odds ratios of 1.15 [95% confidence interval (CI), 0.94-1.40] for the 1G/2G genotype and 1.14 (95% CI, 0.90-1.45) for the 2G/2G genotype, when versus the 1G/1G genotype. Stratified analyses suggested higher lung cancer risk for the 2G allele in never-smokers and males, with the adjusted odds ratios of 1.67 (95% CI, 1.02-2.76; 1G/2G) and 1.50 (95% CI, 0.86-2.62; 2G/2G) in never-smokers; and 1.30 (95% CI, 1.00-1.75; 1G/2G) and 1.23 (95% CI, 0.88-1.73; 2G/2G) in males, respectively. In conclusion, genotypes containing the 2G allele of the MMP-1 polymorphism are associated with higher risk of lung cancer in never-smokers and in males.
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