KIF6 and coronary artery disorder: Since 2007, there have been multiple large prospective and case-control studies on the association of a common KIF6 gene polymorphism—Trp719Arg single-nucleotide polymorphism (SNP) (rs20455)—with CHD risk [14–23], and a significant relationship between the KIF6 Trp719Arg polymorphism and CHD has been observed in several ethnic groups [15, 18, 21, 22, 24–26].