title: No association between a candidate TCF7L2 variant and risk of breast or ovarian cancer.
abstract: BACKGROUND
  TCF7L2 is a transcription factor involved in Wnt/beta-catenin signaling which has a variant known to be associated with risk of Type 2 diabetes and, in some studies, with risk of certain cancers, including familial breast cancer. No studies of ovarian cancer have been reported to date.
  
  
  METHODS
  Two clinic-based case-control studies at the Mayo Clinic were assessed including 798 breast cancer cases, 843 breast cancer controls, 391 ovarian cancer cases, and 458 ovarian cancer controls. Genotyping at TCF7L2 rs12255372 used a 5' endonuclease assay, and statistical analysis used logistic regression among participants as a whole and among a priori-defined subsets.
  
  
  RESULTS
  No associations with risk of breast or ovarian cancer were observed (ordinal model, p = 0.62 and p = 0.75, respectively). In addition, no associations were observed among sub-groups defined by age, BMI, family history, stage, grade, histology, or tumor behavior.
  
  
  CONCLUSIONS
  Although the biology of the Wnt/beta-catenin signaling pathway and prior association between rs12255372 and numerous phenotypes warranted examination of this TCF7L2 SNP, no compelling evidence for association with breast or ovarian cancer was observed.
authors.affiliation: Health Sciences Research, Mayo Clinic College of Medicine, Rochester, USA. egoode@mayo.edu
authors.forename: Ellen L
authors.initials: EL
authors.lastname: Goode
authors.forename: Csilla
authors.initials: C
authors.lastname: Szabo
authors.forename: Ludmila
authors.initials: L
authors.lastname: Prokunina-Olsson
authors.forename: Robert A
authors.initials: RA
authors.lastname: Vierkant
authors.forename: Zachary S
authors.initials: ZS
authors.lastname: Fredericksen
authors.forename: Francis S
authors.initials: FS
authors.lastname: Collins
authors.forename: Kristin L
authors.initials: KL
authors.lastname: White
authors.forename: Michele
authors.initials: M
authors.lastname: Schmidt
authors.forename: Brooke L
authors.initials: BL
authors.lastname: Fridley
authors.forename: Fergus J
authors.initials: FJ
authors.lastname: Couch
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000235:genetics*; D016022:Case-Control Studies; D005260:Female; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000235:genetics*; D012307:Risk Factors; D051820:TCF Transcription Factors / Q000235:genetics*; D058118:Transcription Factor 7-Like 2 Protein; D055815:Young Adult
chemical_list: D051820:TCF Transcription Factors; C544894:TCF7L2 protein, human; D058118:Transcription Factor 7-Like 2 Protein