Toujeo-1, a prospective observational study, investigates the effects of initiating BOT with Gla-300 in insulin-naïve pts with T2DM in Germany (n=1,680) and Switzerland, insufficiently controlled (A1c 7.5-10%) on oral antidiabetic drugs (OADs) in daily clinical practice. Primary endpoint (EP) is the proportion of pts achieving individualized A1c targets after 6 and 12 months, respectively. Secondary EPs include changes in A1c, fasting plasma glucose (FPG), body weight (BW) and insulin dose, hypoglycemia incidence and safety. Here we report results of pts recruited at German sites with 12 months results available (n=674). Pts baseline characteristics, efficacy and hypoglycemia EPs are shown in Table 1. Main OAD treatments were metformin ± DPP-4 inhibitors (49.4%). Twelve months after initiating Gla-300 therapy, proportions of pts at target were 48.4% (A1c at individual target), 30.5% (FPG ≤110 mg/dL), and 60.3% (A1c or FPG at target), respectively. Hypoglycemia rates were low (≤0.events/patient year) and no severe (nocturnal) hypoglycemia was reported. BW remained stable. In conclusion, initiating BOT with Gla-300 allowed insulin-naïve, uncontrolled T2DM pts to reduce their A1c by 1.20% w/o increasing hypoglycemia risk, especially w/o increase in severe (nocturnal) hypoglycemia. Disclosure M. Pfohl: Advisory Panel; Self; Eli Lilly and Company, Novo Nordisk A/S, Sanofi. Speaker's Bureau; Self; Sanofi. A. Fritsche: Advisory Panel; Self; Sanofi-Aventis Deutschland GmbH, Novo Nordisk A/S, Eli Lilly and Company, Boehringer Ingelheim GmbH. H. Anderten: Advisory Panel; Self; Sanofi-Aventis Deutschland GmbH, Merck Sharp & Dohme Corp.. Speaker's Bureau; Self; Sanofi-Aventis Deutschland GmbH, Merck Sharp & Dohme Corp., Eli Lilly and Company, Boehringer Ingelheim GmbH, Pfizer Inc., AstraZeneca, GlaxoSmithKline plc., Novartis AG, Novo Nordisk A/S, Takeda. K. Pegelow: Employee; Self; Sanofi-Aventis Deutschland GmbH. S. Pscherer: Advisory Panel; Self; Sanofi-Aventis Deutschland GmbH. J. Seufert: Speaker's Bureau; Self; AstraZeneca, Berlin-Chemie AG, Boehringer Ingelheim GmbH. Research Support; Self; Boehringer Ingelheim GmbH. Advisory Panel; Self; Boehringer Ingelheim GmbH, GI Dynamics Inc.. Research Support; Self; GI Dynamics Inc., GlaxoSmithKline plc., Intarcia Therapeutics, Inc., Ipsen Biopharmaceuticals, Inc., Janssen Pharmaceuticals, Inc.. Speaker's Bureau; Self; Janssen Pharmaceuticals, Inc.. Advisory Panel; Self; Janssen Pharmaceuticals, Inc.. Speaker's Bureau; Self; Eli Lilly and Company, Merck Sharp & Dohme Corp., Novartis Pharmaceuticals Corporation. Research Support; Self; Novartis Pharmaceuticals Corporation. Advisory Panel; Self; Novo Nordisk A/S. Speaker's Bureau; Self; Novo Nordisk A/S. Research Support; Self; Novo Nordisk A/S. Speaker's Bureau; Self; Sanofi-Aventis Deutschland GmbH. Advisory Panel; Self; Sanofi-Aventis Deutschland GmbH. Research Support; Self; Sanofi-Aventis Deutschland GmbH. Advisory Panel; Self; Sanofi. Research Support; Self; Ypsomed AG.