It was observed that the expression of Glutathione S-transferases-K1, Glutathione S-transferases-K, Glutathione S-transferases-T1, cytochrome p450-1A1 and cytochrome p450-2E1 was significantly higher in individuals with psoriasis versus the control group (p = 0.02, p = 0.001, p = 0.006, p = 0.003 and p = 0.001). Here, GSTK1 is linked to psoriasis.