Efficacy and Safety of Vildagliptin as add-on Therapy to Insulin in Patients With Type 2 Diabetes Mellitus

Inclusion Criteria: * Confirmed diagnosis of T2DM * On a stable dose of insulin as defined by the protocol * On a stable does of metformin (if applicable) as defined by the protocol * Age 18 to 80 years * HbA1c of 7.5 to 11.0% * Body Mass Index (BMI) 22 to 40 kg/m2 Exclusion Criteria: * Type 1 diabetes * Short-acting or rapid-acting insulin * Pregnancy or lactation * Evidence of serious diabetic complications * Evidence of serious cardiovascular complications * Laboratory value abnormalities as defined by the protocol * Other protocol-defined inclusion/exclusion criteria may apply