Cancer Epidemiology Biomarkers & Prevention, Vol 4, Issue 1 63-67, Copyright © 1995 by American Association for Cancer Research

ARTICLES

The heme-binding region polymorphism of cytochrome P450IA1 (CypIA1), rather than the RsaI polymorphism of IIE1 (CypIIE1), is associated with lung cancer in Rio de Janeiro

GS Hamada, H Sugimura, I Suzuki, K Nagura, E Kiyokawa, T Iwase, M Tanaka, T Takahashi, S Watanabe and I Kino
Epidemiology Division, National Cancer Center Research Institute, Tokyo, Japan.

Ile-Val polymorphism in exon 7 of cytochrome P450IA1 (CypIA1) and RsaI polymorphism of cytochrome P450IIE1 (CypIIE1) were examined in a case-control study of lung cancer in Rio de Janeiro, Brazil. The Val-containing genotype in exon 7 of CypIA1 was found to be associated with lung cancer in this population (odds ratio, 2.26; 95% confidence interval, 1.14-4.47 for 99 cases versus 108 controls of 123 matched pairs), whereas RsaI polymorphism in CypIIE1 was not associated with lung cancer susceptibility. In squamous cell carcinoma, the degree of association of Val-containing genotype was greater in those with fewer pack-years of smoking. The RsaI polymorphism of CypIIE1 has a different distribution from the Japanese pattern and is not associated with lung cancer. When we analyzed the association of Ile-Val polymorphism to MspI polymorphism of CypIA1, the Val/Val homozygote was found only in the subpopulation with the MspI site-present homozygote. The apparent lack of association of CypIA1 MspI polymorphism with lung cancer in this area reported in our previous study and the results of the present study indicate that the "true" responsible site for lung cancer susceptibility should be the Ile-Val polymorphism in the catalytic site of CypIA1.

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