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Genetic polymorphism in myeloperoxidase but not GSTM1 is associated with risk of lung squamous cell carcinoma in a Chinese population
Author(s) -
Lu Wenfu,
Xing Deyin,
Qi Jun,
Tan Wen,
Miao Xiaoping,
Lin Dongxin
Publication year - 2002
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.10712
Subject(s) - basal cell , lung , polymorphism (computer science) , carcinoma , myeloperoxidase , chinese population , pathology , squamous cell carcinoma of the lung , population , biology , medicine , lung cancer , oncology , genetics , genotype , gene , environmental health , inflammation
Myeloperoxidase (MPO), an enzyme derived from neutrophils, metabolically activates a wide range of carcinogens, whereas glutathione S ‐transferase M1 (GSTM1) detoxifies various electrophilic metabolites. A ‐463G→A polymorphism in the promoter region of the MPO gene diminishes the expression of MPO and has been consistently shown to be associated with reduced risk of lung cancer in different ethnic populations. In our study, we have assessed the role of this polymorphism in lung cancer risk in a Chinese population. Genotypes of MPO and GSTM1 were determined by PCR‐SSCP and multiplex PCR in 314 patients with lung cancer and 320 frequency‐matched controls. The allele frequency for MPO ‐ 463A was found to be 0.155 in controls and 0.114 in cases. Subjects with the MPO ‐ 463GG genotype were at an increased risk of squamous cell carcinoma (SCC) of the lung compared to those having at least one ‐ 463A variant allele (adjusted odds ratio [OR] 2.35; 95% confidence interval [CI] 1.40–3.94). Stratified analysis suggested an interaction between heavy smoking (≥26 pack‐years) and the MPO‐463GG genotype. The adjusted OR of lung SCC for those having MPO‐463GG genotype and smoked ≥26 pack‐years was 20.50 (95% CI 5.58–75.33) compared to 6.22 (95% CI 1.72–22.47) for those smoked ≥26 pack‐years but having at least one variant A allele ( p = 0.023, test for homogeneity). This effect of the MPO polymorphism was not observed in lung adenocarcinoma. GSTM1 deletion was quite common in both controls (49.4%) and cases (50.3%) but was not associated with risk of lung cancer alone or in combination with the MPO polymorphism. Our results confirm the previous reports showing that the variant A allele of MPO has a protective effect against risk of lung cancer. © 2002 Wiley‐Liss, Inc.