© The Author 2006. Published by Oxford University Press.
EDITORIAL |
The Retinoic Acid Paradox in Cancer Chemoprevention
Affiliations of authors: Departments of Pharmacology and Toxicology (SJF, ED) and Medicine (KHD, ED), Norris Cotton Cancer Center, Dartmouth Medical School, Hanover, NH; Dartmouth-Hitchcock Medical Center, Lebanon, NH (SJF, KHD, ED)
Correspondence to: Sarah J. Freemantle, PhD, Remsen 7650, Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, NH 03755 (e-mail: sarah.freemantle@dartmouth.edu).
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Decades of basic scientific studies and initial clinical trials have indicated a potential role for the classical retinoids in cancer chemoprevention (1). Indeed, the concept of clinical cancer chemoprevention is based largely on preclinical and early clinical studies in which retinoids suppressed epithelial carcinogenesis (25). However, in a recent randomized phase III intergroup chemoprevention trial, the retinoid isotretinoin did not reduce second primary tumor formation, recurrences, or mortality in patients with stage I nonsmall-cell lung cancer (6). And in this issue of the Journal, Khuri et al. (7) report results of a rigorously conducted placebo-controlled phase III trial showing that isotretinoin was not effective in
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