© 1999 by Oxford University Press
Journal of the National Cancer Institute, Vol. 91, No. 7, 578-579,
April 7, 1999
© 1999 Oxford University Press
EDITORIALS |
Molecular Dosimeters of Smoking Damage in the Lung
Affiliation of authors: Departments of Epidemiology and Carcinogenesis, The University of Texas M. D. Anderson Cancer Center, Houston.
Correspondence to: Margaret R. Spitz, M.D., Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Box 189, Houston, TX 77030 (e-mail: mspitz@notes.mdacc.tmc.edu).
Traditional epidemiologic research relied on self-reported measures of "external exposure" in defining the association between cigarette smoking and cancer risk. With elucidation of carcinogen-induced genetic and epigenetic events, knowledge of the molecular etiology of smoking-related cancers has expanded rapidly and has facilitated the study of tobacco carcinogenesis.
The dose of tobacco carcinogens to which lung tissue is exposed is modulated by genetic
polymorphisms in the enzymes responsible for activation (phase I) and detoxification (phase II)
of tobacco carcinogens. For example, the cytochrome(s) P450 multigene superfamily of enzymes
is involved in phase I oxidative processes that may create intermediates that are more reactive
than the parent compounds and can be carcinogenic or mutagenic. Phase II metabolic processes
generally inactivate these
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