IL13 and psoriasis: A less strong association has been found with the rs1156806 variant of the SLC22A4 gene (OR: 0.68, 95% CI: 0.47 to 0.99, and P = 0.043), but by the combination of this SNP with the rs1800925 variant of the IL1-3 gene two common haplotypes strongly associated with psoriasis result.