title: Introduction.
authors.affiliation: Lung and Upper Aerodigestive Cancer Research Group, Division of Cancer Prevention, National Cancer Institute, National Institutes of Health, US Department of Health and Human Services, Bethesda, MD, USA.
authors.forename: Judith J
authors.initials: JJ
authors.lastname: Smith
authors.forename: Barbara K
authors.initials: BK
authors.lastname: Dunn
mesh_terms: D014408:Biomarkers, Tumor; D002986:Clinical Trials as Topic; D006801:Humans; D009369:Neoplasms; D012306:Risk; D012931:Social Environment
chemical_list: D014408:Biomarkers, Tumor