title: A sex-specific association between a 15q25 variant and upper aerodigestive tract cancers.
abstract: BACKGROUND
  Sequence variants located at 15q25 have been associated with lung cancer and propensity to smoke. We recently reported an association between rs16969968 and risk of upper aerodigestive tract (UADT) cancers (oral cavity, oropharynx, hypopharynx, larynx, and esophagus) in women (OR = 1.24, P = 0.003) with little effect in men (OR = 1.04, P = 0.35).
  
  
  METHODS
  In a coordinated genotyping study within the International Head and Neck Cancer Epidemiology (INHANCE) consortium, we have sought to replicate these findings in an additional 4,604 cases and 6,239 controls from 10 independent UADT cancer case-control studies.
  
  
  RESULTS
  rs16969968 was again associated with UADT cancers in women (OR = 1.21, 95% CI = 1.08-1.36, P = 0.001) and a similar lack of observed effect in men [OR = 1.02, 95% CI = 0.95-1.09, P = 0.66; P-heterogeneity (P(het)) = 0.01]. In a pooled analysis of the original and current studies, totaling 8,572 UADT cancer cases and 11,558 controls, the association was observed among females (OR = 1.22, 95% CI = 1.12-1.34, P = 7 × 10(-6)) but not males (OR = 1.02, 95% CI = 0.97-1.08, P = 0.35; P(het) = 6 × 10(-4)). There was little evidence for a sex difference in the association between this variant and cigarettes smoked per day, with male and female rs16969968 variant carriers smoking approximately the same amount more in the 11,991 ever smokers in the pooled analysis of the 14 studies (P(het) = 0.86).
  
  
  CONCLUSIONS
  This study has confirmed a sex difference in the association between the 15q25 variant rs16969968 and UADT cancers.
  
  
  CONCLUSIONS
  Further research is warranted to elucidate the mechanisms underlying these observations.
authors.affiliation: International Agency for Research on Cancer (IARC), 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France.
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mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000569:Americas / Q000453:epidemiology; D016022:Case-Control Studies; D002884:Chromosomes, Human, Pair 15; D005060:Europe / Q000453:epidemiology; D005260:Female; D005838:Genotype; D006258:Head and Neck Neoplasms / Q000453:epidemiology / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012907:Smoking / Q000453:epidemiology / Q000235:genetics