IL10 and gestational diabetes: Three common SNPs in the IL-10 promotor region (−1082 A/G, −819 T/C, and −592 A/C) were evaluated in this study by direct sequencing of the PCR product amplified by primers designed to cover these SNP sites, and the result showed no significant difference in either the genotype or allele frequencies between the GDM and control groups (Table 3).