title: Are there thresholds for carcinogenesis? The thorny problem of low-level exposure.
authors.affiliation: Institute of Environmental Medicine, New York University Medical Center, New York 10016.
authors.forename: A C
authors.initials: AC
authors.lastname: Upton
mesh_terms: D000818:Animals; D000830:Animals, Laboratory; D002273:Carcinogens; D002471:Cell Transformation, Neoplastic; D002869:Chromosome Aberrations; D002999:Clone Cells; D004781:Environmental Exposure; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology; D008452:Maximum Allowable Concentration; D012907:Smoking
chemical_list: D002273:Carcinogens