In addition, Jung et al. showed that CTRP9 was related to the degree of vascular stiffness in patients with T2DM [30], and Schurgers et al. showed [31] that in renal transplant recipients, CTRP9 levels were negatively related to the aortic calcification score (ACAI). This evidence concerns the gene C1QTNF9 and type 2 diabetes mellitus.