In order to elucidate if the variants found in NOX4 are specific to PAM, we genotyped the three SNPs rs781430033 (NOX4Y512IfsX20), rs765662279 (NOX4V369F), and rs144215891 (NOX4Y512C) in previously described case-control cohorts of psoriasis (n = 1874) and age and gender-matched healthy controls from Sweden (n = 484). Here, NOX4 is linked to psoriasis.