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There are no studies of the possible association of the human leukocyte antigen (HLA) system with lichen planopilaris (LPP). To determine whether the HLA system is associated with LPP, 40 consecutive Jewish Israeli patients with LPP (study group) and 252 volunteers (controls) were typed for DRB1*and DQB1* loci by molecular methods. Compared with controls, the study group had a significantly higher frequency of the DRB1*11 allele (62% vs. 21%, corrected p-value (pc) = 0.001) owing to increased frequencies of DRB1*11: 01 and DRB1*11: 04. The DQB1*03 allele was also expressed at a significantly higher frequency in the study group (70% vs. 33%, pc = 0.0005); specifically, the frequency of DQB1*03: 01 was increased. The majority (82.5%) of the patients were of non-Ashkenazi origin. We conclude that LPP appears to be over-represented in non-Ashkenazi Jewish patients and is associated with an increased frequency of HLA DRB1*11 and DQB1*03 alleles. These findings suggest that immunogenetic factors play a role in LPP.

Lichen Planopilaris is Associated with HLA DRB1*11 and DQB1*03 Alleles

Lichen Planopilaris is Associated with HLA DRB111 and DQB103 Alleles