Evaluate the Efficacy and Safety of Saxagliptin Added to Insulin Monotherapy or to Insulin Combined With Metformin in Chinese Subjects With Type 2 Diabetes Who Have Inadequate Glycaemic Control

Saxagliptin 5mg (plus stable insulin dose), given orally once daily (24 weeks); subjects stratified by use of stable metformin dose; flexible insulin dose (as needed for rescue).

Placebo tablets (plus stable insulin dose), given orally once daily (24 weeks); subjects stratified by use of stable metformin dose; flexible insulin dose (as needed for rescue).