Four single nucleotide polymorphisms (SNPs) and their association with psoriasis were examined in 1810 psoriasis cases, 2522 controls and 509 pedigrees. Two IL12B markers showed a highly significant correlation with psoriasis in the case control study (rs3212227, odd ratio [OR]: 1.62 and rs6887695, OR: 1.49) and in the family based analysis. Two IL23R SNPs also showed a significant association in both cases and controls (rs7530511, OR: 1.22 and rs11209026, OR: 1.40). No statistical evidence for interactions of these haplotypes with HLA-Cw6 was found. The association between IL12B and IL23R and psoriasis was confirmed (Nair, RP. et al. J Invest Dermatol 2008, 128[7]: 1653-1661). --> -->