On the other hand, the presence of an A allele in position 1009 of KCNJ11 (haplotypes G/A or A/A) was associated with the presence of T2DM (p = 0.0001) and, in particular, in patients with CAD compared with microvascular dysfunction (p = 0.0001) as well as with normal coronary arteries (p = 0.0001). Here, KCNJ11 is linked to coronary artery disorder.