The Etiology and Prevention of Aerodigestive Tract Cancers.- Epidemiology of Vitamin A and Aerodigestive Cancer.- Multiple Primary Squamous Carcinomas of the Upper Aerodigestive Tract.- Genetic and Environmental Interactions as Risks for Aerodigestive Cancers.- Alcohol: A Cocarcinogen in Head and Neck Malignancies.- Smokeless Tobacco and Aerodigestive Tract Cancers: Recent Research Directions.- Biologic Markers as Predictors of Risk in Aerodigestive Tract Cancers.- Hamster Lung Cancer Model of Carcinogenesis and Chemoprevention.- The Hamster Cheek Pouch Model of Carcinogenesis and Chemoprevention.- Culture Conditions Affect Expression of the ?6?4 Integrin Associated with Aggressive Behavior in Head and Neck Cancer.- Growth Factors and Other Targets for Rational Application as Intervention Agents.- Hyperplasia and Squamous Metaplasia in the Tracheobronchial Epithelium: Alterations in the Balance of Growth and Differentiation Factors.- Micronuclei as Intermediate End Points in Intervention.- Study Design for the Prevention of Aerodigestive Tract Cancers.- Participant Enrollment, Participation, and Compliance in Chemoprevention Trials.- A Population-based Trial of ?-Carotene Chemoprevention of Head and Neck Cancer.- Chemoprevention of Barrett's Esophagus and Oral Leukoplakia.- Carotene and Retinol Efficacy Trial: Lung Cancer Chemoprevention Trial in Heavy Cigarette Smokers and Asbestos-exposed Workers.- An Intervention Trial in High-Risk Asbestos-exposed Persons.- Chemoprevention-of Aerodigestive Epithelial Cancers.- Contributors.