Moreover, a few of these studies reported the associations between the CYP7A1 gene polymorphisms and such diseases like gallbladder stone [9], gallbladder cancer [10, 11], proximal colon cancer [12–15], neuromyelitis optica [16], or coronary artery disease [8, 17, 18]. The gene discussed is CYP7A1; the disease is coronary artery disorder.