Korean J Prev Med.  1999 Jun;32(2):123-129.

A Case-Control Study on Effects of Genetic Polymorphisms of GSTM1, GSTT1, CYP1A1 and CYP2E1 on Risk of Lung Cancer

• Nan HM
• Kim H
• Kang JW
• Bae JW
• Choe KH
• Lee KH
• Kim ST
• Won CH
• Kim YM

Abstract

OBJECTIVES
This study was performed to investigate effects of genetic polymorphisms of glutathione S-transferase M1 (GSTM1), glutathione S-transferase M1 (GSTT1), cytochrome P450 1A1 (CYP1A1) and cytochrome P450 2E1 (CYP2E1) on lung cancer development.
METHODS
Ninety-eight lung cancer patients and 98 age-sex matched non-cancer patients hospitalized in Chungbuk National University Hospital from March 1997 to August 1998, were the subjects of this case-control study. Direct interview was done and genotypes of GSTM1, GSTT1, CYP1A1 and CYP2E1 were investigated using multiplex PCR or PCR-RFLP methods with DNA extracted from venous blood. Effects of the polymorphisms of GSTM1, GSTT1, CYP1A1 and CYP2E1, lifestyle factors including smoking, and their interactions on lung cancer were statistically analyzed.
RESULTS
GSTM1 was deleted in 67.01% of the cases and 58.16% of the controls, and the odds ratio(95% CI) was 1.46(0.82-2.62). GSTT1 deletion was 58.76% for the lung cancer patients and 50.00% for the controls OR:1.43(0.81-2.51). The frequencies of Ile/Ile, Ile/Val and Val/Val of the CYP1A1 polymorphisms were 59.18%, 35.71%, and 5.10% for the cases, and 52.04%, 45.92%, 2.04% for the controls, respectively. Risk of lung cancer was not associated with polymorphism of CYP1A1 (x2trend=0.253, p-value>0.05). The respective frequency of c1/c1, c1/c2, c2/c2 genotypes for CYP2E1 were 50.00%, 42.86%, 7.14% for the lung cancer patients, and 66.33%, 30.61%, 3.06% for the controls (x2trend=5.783, p<0.05). c2 allele was a significant risk factor for lung cancer. We also observed a significant association of cigarette smoking history with lung cancer risk. The odds ratio(95% CI) of cigarette smoking was 3.03(1.58-5.81). In multiple logistic analysis including genotypes of GSTM1, GSTT1, CYP1A1 and CYP2E1, and smoking habit, only smoking habit came out to be a significant risk factor for lung cancer.
CONCLUSION
Genetic polymorphisms of GSTM1, GSTT1, CYP1A1 and CYP2E1 are not so strongly associated with lung cancer as lifestyle factors including cigarette smoking.

Keyword

Lung cancer; GSTM1; GSTT1; CYP1A1; CYP2E1; Polymorphism

MeSH Terms

Alleles
Case-Control Studies*
Chungcheongbuk-do
Cytochrome P-450 CYP1A1*
Cytochrome P-450 CYP2E1*
Cytochrome P-450 Enzyme System
DNA
Genotype
Glutathione Transferase
Humans
Life Style
Lung Neoplasms*
Lung*
Multiplex Polymerase Chain Reaction
Polymorphism, Genetic*
Risk Factors
Smoke
Smoking
Cytochrome P-450 CYP1A1
Cytochrome P-450 CYP2E1
Cytochrome P-450 Enzyme System
DNA
Glutathione Transferase
Smoke