title: Hepatitis C virus-associated oral lichen planus: is the geographical heterogeneity related to HLA-DR6?
abstract: BACKGROUND
  The association between hepatitis C virus (HCV) and oral lichen planus (OLP) is more common in the Mediterranean area and Japan, possibly because of immunogenetic factors.
  
  
  METHODS
  Intermediate-resolution HLA-DRB typing by hybridization with oligonucleotide probes was performed in 31 Italian OLP patients with HCV infection, in 45 Italian OLP and in 48 British OLP patients without HCV infection. As healthy controls we included data from 145 unrelated Italian and 101 unrelated British bone marrow donors.
  
  
  RESULTS
  Italian HCV+ve OLP patients possessed the HLA-DR6 allele more frequently than Italian and British OLP patients without HCV infection (51.6% vs. 17.7% vs. 16.7%; P corrected = 0.028 and 0.017, respectively). There was no difference in the frequency of the HLA-DR6 allele between Italian and British control subjects.
  
  
  CONCLUSIONS
  The present data suggest that HLA-DR6 may be responsible for the peculiar geographic heterogeneity of the association between HCV and OLP.
authors.affiliation: Department of Biomedical Sciences and Human Oncology, Oral Medicine Section, School of Medicine and Dentistry, University of Turin, Italy. marco.carrozzo@unito.it
authors.forename: M
authors.initials: M
authors.lastname: Carrozzo
authors.forename: F
authors.initials: F
authors.lastname: Brancatello
authors.forename: E
authors.initials: E
authors.lastname: Dametto
authors.forename: P
authors.initials: P
authors.lastname: Arduino
authors.forename: M
authors.initials: M
authors.lastname: Pentenero
authors.forename: S
authors.initials: S
authors.lastname: Rendine
authors.forename: S R
authors.initials: SR
authors.lastname: Porter
authors.forename: G
authors.initials: G
authors.lastname: Lodi
authors.forename: C
authors.initials: C
authors.lastname: Scully
authors.forename: S
authors.initials: S
authors.lastname: Gandolfo
mesh_terms: D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D005260:Female; D005787:Gene Frequency; D018740:Genetic Heterogeneity; D015808:HLA-DR6 Antigen / Q000235:genetics*; D016174:Hepacivirus / Q000145:classification / Q000235:genetics; D006526:Hepatitis C / Q000150:complications* / Q000235:genetics; D018937:Hepatitis C Antibodies / Q000097:blood; D006801:Humans; D007125:Immunogenetics; D007558:Italy; D017676:Lichen Planus, Oral / Q000235:genetics / Q000821:virology*; D008297:Male; D008875:Middle Aged; D006113:United Kingdom
chemical_list: D015808:HLA-DR6 Antigen; D018937:Hepatitis C Antibodies