Almawi et al. [21], reported an OR of 10.5 (95% CI = 4.3–25.3) or 6.3 (95% CI = 1.5–26.0) for joint occurrence of the F5 G1691A or F2 G20210A with MTHFR 677TT genotype, respectively, enhancing the risk for deep vein thrombosis (DVT). The gene discussed is MTHFR; the disease is deep vein thrombosis.