MMP9 and type 2 diabetes mellitus: The minor allele of the SNP 1562C > T (rs3918242, https://www.ncbi.nlm.nih.gov/snp/?term=rs3918242) near the promoter region of the MMP-9 gene has been associated with increased circulating levels of MMP-9 and with higher frequencies of vascular disease, especially in type 2 diabetes [18, 19].