Carcinogenesis, Vol. 22, No. 6, 913-916,
June 2001
© 2001 Oxford University Press
MOLECULAR EPIDEMIOLOGY AND CANCER PREVENTION |
Gene–environment interaction between an aldehyde dehydrogenase-2 (ALDH2) polymorphism and alcohol consumption for the risk of esophageal cancer
1 Division of Epidemiology and Prevention,
2 Department of Rehabilitation Service, and
3 Department of Thoracic Surgery, Aichi Cancer Center, 1-1 Kanokoden, Chikusa-ku, Nagoya, Aichi 464-8681 and
4 Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi 466-8550, Japan
Aldehyde dehydrogenase-2 (ALDH2) degrades acetaldehyde metabolized from ethanol. Its encoding gene ALDH2 has a functional polymorphism: ALDH2 Glu487Lys. An association between this polymorphism and esophageal cancer among alcoholics has been reported. To further evaluate the gene–environment interaction, a hospital-based case–control study was conducted. Cases were 102 patients with histologically confirmed esophageal cancer and controls were 241 non-cancer outpatients of Aichi Cancer Center. ALDH2 genotypes were examined by a PCR–CTPP method developed in our laboratory, which does not require a digestion stage. Logistic regression analysis was employed for estimation of relative risk and gene–environment interaction. The allele frequency for ALDH2 Lys487 was 0.28, consistent with previous reports. The age, sex, smoking and drinking status adjusted odds ratio for the ALDH2 Glu/Lys and Lys/Lys genotypes as compared with the Glu/Glu genotype was 3.43 (95% CI 1.74–6.75). The odds ratio for heavy drinking was 49.6 (14.5–169.4) among Lys487 carriers and 7.84 (2.77–22.2) for the Glu/Glu genotype. The gene–environment interaction between alcohol drinking and the ALDH2 Lys487 allele was 6.84 (2.39–19.6), whereas no significant interaction was obtained with smoking status. Although limited because of its prevalent case–control design, our study revealed a strong gene–environment interaction between ALDH2 polymorphism and heavy alcohol consumption. Taking the observed high risk of esophageal cancer in association with the ALDH2 Lys487 allele into consideration, reducing alcohol intake may be most protective among Lys487 allele carriers of this polymorphism.
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