Carcinogenesis, Vol 19, 813-817, Copyright © 1998 by Oxford University Press
E Taioli, J Ford, J Trachman, Y Li, R Demopoulos and S Garte
The role of CYP1A1 genotype in lung cancer risk was assessed in African
Americans through a case control study. The complete CYP1A1 genotype,
including the frequency of all three polymorphisms (Msp1 [CYP1A1*2], exon 7
[CYP1A1*3] and African American specific [CYP1A1*4]) was determined by PCR
on 307 controls and 105 cases of lung cancer among African Americans. We
have confirmed our earlier observation of a significant increased risk
(odds ratio = 2.8, 95% CI = 1.3-6.5) for lung adenocarcinoma among people
with the *4 polymorphism, although we did not observe any association of
this polymorphism with overall lung cancer risk. As previously reported, we
found that lung adenocarcinoma patients with the *4 RFLP smoked
significantly less than patients without this polymorphism, suggesting an
important role in cancer risk of low exposure levels to cigarette smoke in
subjects carrying susceptibility polymorphisms. There was no association
with the other two polymorphisms and lung cancer in this population. When
we examined lung cancer risk as a function of composite genotype, taking
into account all three polymorphisms simultaneously in each subject, our
preliminary data suggested an association of one rare genotype (homozygous
Msp1, heterozygous exon 7 or *2/*2*3) with overall lung cancer risk (OR =
8.4, 95% CI = 1.6-43.2).
ARTICLES
Lung cancer risk and CYP1A1 genotype in African Americans
Department of Environmental Medicine, New York University Medical Center, New York 10016, USA.
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