All published studies and references are shown in Additional file 1, Table S2, which indicates the inconsistency for associations between HHEX, IGF2BP2, TCF2, and FTO with T2D, the low MAF of WFS1-rs6446482 and FTO-rs8050136, and the small sample sizes in all studies in Chinese compared with those in Caucasian populations. The gene discussed is FTO; the disease is type 2 diabetes mellitus.