In meta-regression and subgroup analysis, we observed significant associations between the effect size of ICAM-1 and the use of glucocorticoids, between the effect size of VCAM-1 and ERS, between the effect size of VCAM-1, E-selectin, and P-selectin and study continent, and between the effect size of P-selectin and the type of matrix assessed (plasma vs. serum). This evidence concerns the gene ICAM1 and amelogenesis imperfecta type 1G.