HLA-DRB1 and Kaposi's sarcoma: In a familial clustering of classic KS, the homozygous HLA‐A*24/B*18/Cw*12/DRB1*11/DQB1*03 haplotype was present in family members with KS and not in those without KS, with the DRB1*11 subtype present in most family members.39