Figure 1 shows the linkage disequilibrium plot of the GCLC gene generated by the Haploview software. The polymorphism rs17883901 was not linked to any of the other studied SNPs in the GCLC gene. As can be seen from Table 4, none of the haplotypes was meaningfully associated with the risk of psoriasis, both in the entire and sex-stratified groups (Pperm > 0.05). This evidence concerns the gene GCLC and psoriasis.