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OBJECTIVE The objective of this study was to evaluate the efficacy and safety of the dual sodium–glucose cotransporter 1 and 2 inhibitor sotagliflozin compared with placebo when combined with optimized insulin in adults with type 1 diabetes (T1D). RESEARCH DESIGN AND METHODS In a double-blind, 52-week, international phase 3 trial, adults with T1D were randomized to placebo (n = 258) or once-daily oral sotagliflozin 200 mg (n = 261) or 400 mg (n = 263) after 6 weeks of insulin optimization. The primary outcome was change in HbA1c from baseline to 24 weeks. The first secondary end point was a composite of the proportion of patients with HbA1c RESULTS At 24 weeks, placebo-adjusted changes in HbA1c from baseline (7.8%) were −0.37% and −0.35% with sotagliflozin 200 and 400 mg, respectively (P < 0.001), and differences were maintained at 52 weeks. At 52 weeks, greater proportions of sotagliflozin-treated patients (200 mg: 25.67%; 400 mg: 26.62%) than placebo-treated patients (14.34%; P ≤ 0.001) met the composite end point, and sotagliflozin 400 mg reduced fasting plasma glucose (−0.87 mmol/L; P = 0.008), weight (−2.92 kg; P < 0.001), and total daily insulin dose (−8.2%; P = 0.001). In a 24-week continuous glucose monitoring (CGM) substudy, postprandial glucose decreased (P ≤ 0.009) and CGM demonstrated up to 3 h more time in the target range of 3.9–10.0 mmol/L with sotagliflozin. Treatment satisfaction increased and diabetes distress decreased with sotagliflozin (P < 0.05 vs. placebo). The frequency of documented hypoglycemia was lower with sotagliflozin, and severe hypoglycemia occurred by week 52 in 13 patients (5.0%), 13 patients (5.0%), and 6 patients (2.3%) treated with placebo and sotagliflozin 200 and 400 mg, respectively. DKA occurred in 0 of 258 patients, 6 of 261 patients (2.3%), and 9 of 263 patients (3.4%) in these respective groups. CONCLUSIONS In a 1-year study, sotagliflozin was associated with statistically significant HbA1c reductions. More episodes of DKA and fewer episodes of documented and severe hypoglycemia were observed in patients using sotagliflozin relative to those receiving placebo (ClinicalTrials.gov, NCT02421510).

The objective of this study was to evaluate the efficacy and safety of the dual sodium-glucose cotransporter 1 and 2 inhibitor sotagliflozin compared with placebo when combined with optimized insulin in adults with type 1 diabetes (T1D).In a double-blind, 52-week, international phase 3 trial, adults with T1D were randomized to placebo (At 24 weeks, placebo-adjusted changes in HbAIn a 1-year study, sotagliflozin was associated with statistically significant HbA