Carcinogenesis, Vol. 21, No. 6, 1163-1166,
June 2000
© 2000 Oxford University Press
Molecular Epidemiology and Cancer Prevention |
Genetic variants of myeloperoxidase and lung cancer risk
1 The University of Texas M.D. Anderson Cancer Center, Department of Epidemiology, Box 189, 1515 Holcombe Boulevard, Houston and
2 University of Texas, The School of Public Health, The University of Texas Health Science Center at Houston, 1200 Herman Pressler, Houston, TX 77030, USA
The cytochrome P450 family of enzymes is responsible for many of the initial metabolic conversions of procarcinogenic compounds in tobacco smoke to reactive metabolites. However, other enzyme-based systems such as myeloperoxidase (MPO) may also be involved in this metabolic process. MPO is a phase I metabolic enzyme that has a polymorphic region upstream of the gene that appears to reduce transcriptional activity. The polymorphic G
A nucleotide base shift negates the binding region for the general transcription factor SP1. Thus, individuals with the variant allele may be provided with a protective effect due to decreased metabolic conversion of carcinogenic compounds in tobacco smoke. This study has investigated the hypothesis that individuals with the variant allele may be at a reduced risk for lung cancer. Our results demonstrate that the protective effects of the MPO variant allele reduced overall lung cancer risk in Caucasians by 48% (OR = 0.52, 95% CI 0.30–0.90, P = 0.02). There was a 72% protective effect (OR = 0.28, 95% CI 0.12–0.61, P < 0.05) evident in men but not in women. Additionally, in younger individuals (<61 years) there was a statistically significant 72% reduction in risk (OR = 0.28, 95% CI 0.11–0.69, P < 0.05) but not in older individuals. A protective effect was observed for current smokers (OR = 0.24, 95% CI 0.10–0.58, P < 0.05) but not in former smokers and those who had never smoked. These data demonstrate that there is a reduction in lung cancer risk associated with a variant allele of MPO that is evident in men, younger individuals and current smokers.
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