title: False positives in cancer epidemiology.
abstract: BACKGROUND
  A recent attempt to estimate the false-positive rate for cancer epidemiology studies is based on agents in International Agency for Research on Cancer (IARC) category 3 (agent not classifiable as to its carcinogenicity to humans) in the IARC Monographs Program.
  
  
  METHODS
  The estimation method is critiqued regarding biases caused by its reliance on the IARC classification criteria for assessing carcinogenic potential.
  
  
  RESULTS
  The privileged position given to epidemiologic studies by the IARC criteria ensures that the percentage of positive epidemiologic studies for an agent will depend strongly on the IARC category to which the agent is assigned. Because IARC category 3 is composed of agents with the lowest-assessed carcinogenic potential to which the estimation approach in question could be applied, a spuriously low estimated false-positive rate was necessarily the outcome of this approach.
  
  
  CONCLUSIONS
  Tendentious estimation approaches like that employed will by necessity produce spuriously low and misleading false positive rates.
  
  
  CONCLUSIONS
  The recently reported estimates of the false-positive rate in cancer epidemiology are seriously biased and contribute nothing substantive to the literature on the very real problems related to false-positive findings in epidemiology.
authors.affiliation: International Epidemiology Institute, 1455 Research Boulevard, Suite 550, Rockville, MD 20850, USA. jkm@iei.us
authors.forename: Joseph K
authors.initials: JK
authors.lastname: McLaughlin
authors.forename: Robert E
authors.initials: RE
authors.lastname: Tarone
mesh_terms: D015982:Bias; D002273:Carcinogens / Q000145:classification / Q000633:toxicity*; D016021:Epidemiologic Studies; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007390:International Agencies / Q000592:standards*; D008297:Male; D020380:Needs Assessment; D009369:Neoplasms / Q000139:chemically induced* / Q000453:epidemiology*
chemical_list: D002273:Carcinogens