However, the MTHFR 1298A>C increased the BD occurrence in the heterozygous codominant (p = 0.031, OR = 2.030, 95% CI = 1.068–3.862) and dominant models (p = 0.008, OR = 1.326, 95% CI = 1.075–1.636). The gene discussed is MTHFR; the disease is Behcet disease.