S100A7 and psoriasis: When the top associated SNPs in PSOR1 locus were controlled, stepwise logistic regressions of 3,033 SNPs from the MHC region largely showed two sets of markers (Model 1, 2 vs Model 3, 4) associated with psoriasis, although starting four SNPs (rs130065, rs3130457, rs1265181 and rs10484554) are in strong LD.