Type 2 diabetes age of 33 patients who were using insulin were 39.42 ± 15.52 months, 35 patients who used oral antidiabetic medicine were 20.2 ± 9.26 months and 20 patients who were started to use oral antidiabetic drugs during preoperative assessment were 9.6 ± 3.34 months (diabetes age was calculated from the diagnose date to the operation date, it takes about 6–18 months to have an operation appointment in our clinic). The gene discussed is INS; the disease is type 2 diabetes mellitus.