Kirmit et al. evaluated 87 patients with psoriasis in comparison with 60 healthy subjects and showed a significant increase in oxidative stress markers, namely catalase (p = 0.04), ferroxidase, myeloperoxidase and ischemia-modified albumin (p < 0.001 for all), in psoriasis versus the control group [14]. This evidence concerns the gene CAT and psoriasis.