title: The platelet glycoprotein Ibalpha VNTR polymorphism is associated with risk for oral cancer.
abstract: BACKGROUND
  We have previously found an association of platelet glycoprotein Ia polymorphism with increased risk for oral cancer. The purpose of this study was to investigate the possible relation of another platelet glycoprotein, Iba (GPIbalpha), with oral oncogenesis.
  
  
  METHODS
  The variable number of tandem repeats (VNTR) polymorphism of the GPIbalpha gene, which affects the protein's structure and function, was examined in 162 Greek and German patients with oral squamous cell carcinoma and 225 healthy controls of equivalent age, gender and ethnicity.
  
  
  RESULTS
  The B allele frequency detected, representing higher platelet activation, in the patient group and in the subgroups of patients without family history either of cancer or thrombophilia were significantly elevated in comparison with that of the control group (p = 0.03, p = 0.016 and p = 0.036, respectively). The D allele frequency (lower platelet activation) was significantly lower in comparison with controls only in patients with family history of thrombophilia. The frequency of B/B homozygotes was significantly increased in the total group of patients and the subgroup of patients with a family history of thrombophilia, in comparison with the control group (p = 0.042 and p = 0.043, respectively), while the frequency of heterozygotes for the C/B alleles was significantly lower in the subgroups of patients with a family history of cancer and thrombophilia (p = 0.036 and p = 0.027, respectively) compared to the control group.
  
  
  CONCLUSIONS
  The VNTR polymorphism of the GPIbalpha gene, which affects the structure and function of this platelet glycoprotein, seems to be associated with risk for oral cancer, especially in patients without a family history of cancer.
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Athens Medical School, "Attikon" Hospital, Rimini 1, GR-12462, Greece. lvairakt@med.uoa.gr
authors.forename: Eleftherios
authors.initials: E
authors.lastname: Vairaktaris
authors.forename: Zoe Charalambous
authors.initials: ZC
authors.lastname: Serefoglou
authors.forename: Christos
authors.initials: C
authors.lastname: Yapijakis
authors.forename: Stavros
authors.initials: S
authors.lastname: Vassiliou
authors.forename: Emeka
authors.initials: E
authors.lastname: Nkenke
authors.forename: Dimitris
authors.initials: D
authors.lastname: Avgoustidis
authors.forename: Antonis
authors.initials: A
authors.lastname: Vylliotis
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Stathopoulos
authors.forename: Friedrich W
authors.initials: FW
authors.lastname: Neukam
authors.forename: Efstratios
authors.initials: E
authors.lastname: Patsouris
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D001792:Blood Platelets / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000097:blood / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D018598:Minisatellite Repeats; D009062:Mouth Neoplasms / Q000097:blood / Q000235:genetics*; D019038:Platelet Glycoprotein GPIb-IX Complex / Q000235:genetics*
chemical_list: D019038:Platelet Glycoprotein GPIb-IX Complex