HLA-C and psoriasis: Furthermore, data analyses demonstrate that they are not simply reflecting linkage disequilibrium with HLA-C, since 1) the associations are not secondary to HLA-Cw*0602 as shown in the analyses adjusted for HLA-Cw*0602 or within the HLA-Cw*0602-negative subset of samples, 2) further adjustment for HLA-Cw*1203 in analyses did not substantially change our results, and 3) no other HLA-C major allele showed association with psoriasis in our data.