© 1999 by Oxford University Press
Journal of the National Cancer Institute, Vol. 91, No. 1, 7-9,
January 6, 1999
© 1999 Oxford University Press
EDITORIALS |
Lung Cancer Promotion by ß-Carotene and Tobacco Smoke: Relationship to Suppression of Retinoic Acid Receptor-ß and Increased Activator Protein-1?
Correspondence to: Reuben Lotan, Ph.D., Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030.
A considerable number of epidemiologic studies conducted in the
1970s and 1980s indicated that an inverse relationship exists between
estimated intakes of ß-carotene and the risk of developing various
types of cancer, especially lung cancer. These studies have led to the
suggestion that dietary ß-carotene can reduce human cancer rates
(1,2). Subsequent observational cohort and nested
case-control studies based on measurement of carotenoids in blood and
tissues showed consistent inverse association between blood
ß-carotene and risk of lung cancer (1). Initially, it was
thought that the conversion of ß-carotene to retinol (1,3)
is the mechanism of its cancer preventive effects. However, the
inability to demonstrate a consistent negative association between
plasma retinol levels and cancer risk has led to the proposal that
ß-carotene itself might exert chemopreventive effects. Several
mechanisms have been proposed for such effects: 1) action as an
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