HLA-DRB1 and Kaposi's sarcoma: In a study of classic KS in a Sardinian population (high risk for classic KS), a number of class I and class II HLA haplotypes were associated with an increased (class I: HLA‐CW7; Class II: HLA‐DRB1*1104, HLA‐DRB1*1302, HLA‐DQA1*0302, HLA‐DQB1*0604) or decreased (class I: HLA‐A30, HLA‐CW5, HLA‐B58; class II: HLA‐DRB1*1601, HLA‐DQB1*0502) risk of classic KS.55