Further logistic regression analyses demonstrated that ghrelin levels were an independent factor for mild cognitive impairment (MCI) in patients with type 2 diabetes mellitus (T2DM), additionally, partial correlation analyses indicated that growth hormone-releasing peptide levels were positively correlated with delayed recall scores on the Montreal Cognitive Assessment and the Auditory Verbal Learning Test (Huang et al., 2017). This evidence concerns the gene GHRL and type 2 diabetes mellitus.