The following 9 eligible studies were included in the final analysis: 5 arteticles, which included 6 studies related to VDR SNP rs739837 and T2DM (one study only had allele mode data); and 3 articles, which included 3 studies related to VDR SNP rs739837 and GDM. The gene discussed is VDR; the disease is type 2 diabetes mellitus.