Moreover, after adjustment for ethnicity, higher serum levels of IL-17 were associated with psoriasis in Asians, but not in Caucasians (Supplementary Table 1, Asians: SMD = 0.54, 95% CI -0.44 to 1.51, I2 = 96.1%; Caucasians: SMD = 0.27, 95% CI 0.04 to 0.49, I2 = 0%). Here, IL17A is linked to psoriasis.