“…First, the sample size in our study was relatively modest, especially in ethnicity subgroup analysis, so the power of the association analysis was inevitably low. Second, as with other complex traits, psoriasis is polygenic and may also be modulated by several other genetic markers beyond VEGF, including HLA-Cw6, TNF-a, IL23R, and several other candidate genes (Li et al, 2007;Wu et al, 2011;Zhu et al, 2012). Thus, our meta-analysis emphasizes that elucidating the pathogenesis of psoriasis would demand further evaluation of the potential gene-gene interactions.…”