Interestingly, in assessing the polymorphism rs6265 in the BDNF gene, its combined effect with higher BMI was found to increase the risk and clinical severity of psoriasis in the Chinese Han population [66]; nevertheless, as shown in both this and our previous [21] studies, we found no significant results in the case of rs6265 in our psoriasis cohort. Here, BDNF is linked to psoriasis.