....In the surgery group, remission of type 2 diabetes was observed in 66 of 88 patients (75%) at 2 years, in 54 of 87 patients (62%) at 6 years,11,12 and in 43 of 84 patients (51%) at 12 years (Table 3). Of the 62 patients in the surgery group who had initial remission at 2 years and had 12-year follow-up data, 69% remained free of type 2 diabetes at 12 years. When the remission rate of type 2 diabetes at 12 years in the surgery group was compared with that in the nonsurgery groups, the adjusted odds ratio for remission was 8.9 (95% CI, 2.0 to 40.0) for the surgery group versus nonsurgery group 1 and 14.8 (95% CI, 2.9 to 75.5) for the surgery group versus nonsurgery group 2 (P<0.001 for both comparisons) (Table 3).

Successful remission of type 2 diabetes was strongly predicted by baseline medication status. Remission of type 2 diabetes at 12 years was observed in 16 of 22 patients in the surgery group (73%; 95% CI, 46 to 99) who had type 2 diabetes but had not been receiving antidiabetic medications at baseline, as compared with 24 of 43 patients with diabetes (56%; 95% CI, 35 to 77) who had been receiving only oral medications at baseline and 3 of 19 patients with diabetes (16%; 95% CI, −8 to 39) who had been receiving insulin (with or without additional oral antidiabetic medication) at baseline.......

https://www.nejm.org/doi/full/10.1056/NEJMoa1700459