title: Association of hypoxia-inducible factor 1-alpha gene polymorphisms and colorectal cancer prognosis.
abstract: BACKGROUND
  Hypoxia inducible factor-1 (HIF-1) is the key regulator of cellular responses to hypoxia and plays a central role in tumour growth. Recently, two single nucleotide polymorphisms (SNPs) in the HIF-1 alpha gene, C1772T and G1790A, were shown to cause significantly higher transcriptional activity than did the wild-type. This study aimed to investigate the effect of these SNPs on the prognosis of colorectal cancer (CRC).
  
  
  METHODS
  DNA from 336 CRC patients was genotyped. Genotypes of each polymorphism were tested for association with disease-free survival (DFS) using univariate and multivariate Cox-regression analysis.
  
  
  RESULTS
  Genotype frequencies were: CC 75.6%, CT 18.8% and TT 1.8% for HIF1A1 C1772T and GG 93.2%, GA 2.7% and AA 0% for G1790A. A statistically significant association between DFS and clinicopathological features was observed. However, no association was found between HIF1A1 C1772T (p=0.44; risk ratio of recurrence, RR=1.19, 95% confidence interval, CI=0.77 to 1.83) and G1790A (p=0.89; RR=0.92, 95% CI=0.29 to 2.90) polymorphisms and DFS in univariate and multivariate Cox-regression analysis.
  
  
  CONCLUSIONS
  These results suggest that HIF1A1 C1772T and G1790A polymorphisms are not involved in the progression or metastasis of CRC.
authors.affiliation: Division of Oncology, Department of Internal Medicine, Medical University of Graz, Auenbruggerplatz 15, A-8036 Graz, Austria.
authors.forename: Joanna
authors.initials: J
authors.lastname: Szkandera
authors.forename: Gudrun
authors.initials: G
authors.lastname: Knechtel
authors.forename: Michael
authors.initials: M
authors.lastname: Stotz
authors.forename: Günter
authors.initials: G
authors.lastname: Hofmann
authors.forename: Uwe
authors.initials: U
authors.lastname: Langsenlehner
authors.forename: Peter
authors.initials: P
authors.lastname: Krippl
authors.forename: Tanja
authors.initials: T
authors.lastname: Langsenlehner
authors.forename: Dadbeh
authors.initials: D
authors.lastname: Dehchamani
authors.forename: Hellmut
authors.initials: H
authors.lastname: Samonigg
authors.forename: Wilfried
authors.initials: W
authors.lastname: Renner
authors.forename: Armin
authors.initials: A
authors.lastname: Gerger
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000401:mortality / Q000473:pathology; D018572:Disease-Free Survival; D005260:Female; D005838:Genotype; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D011379:Prognosis; D016016:Proportional Hazards Models
chemical_list: C497442:HIF1A protein, human; D051795:Hypoxia-Inducible Factor 1, alpha Subunit