A Study to Assess Safety and Efficacy of ASP1941 in Combination With Nateglinide in Type 2 Diabetic Patients

Phase III Study of ASP1941 - Open-label, Non-comparative Study to Assess the Long-term Safety, Tolerability and Efficacy of ASP1941 in Combination With Nateglinide in Japanese Patients With Type 2 Diabetes Mellitus Who Have Inadequate Glycemic Control With Nateglinide Alone

This study is to evaluate long-term safety and efficacy after concomitant administration of ASP1941 and Nateglinide inhibitor in Japanese patients with type 2 diabetes mellitus.

This is a 52-week multi-center, open-label, non-comparative study in subjects with type 2 diabetes mellitus who have inadequate glycemic control on Nateglinide alone more than 4 weeks. Dosage may be increased during the treatment period if subjects fulfill increasing criteria and the investigators adjudicate that no impact for subjects safety.

Inclusion Criteria:

• Type 2 diabetic patients receiving with Nateglinide mono-therapy for at least 4 weeks
• HbA1c value between 6.5 and 9.5%
• Body Mass Index (BMI) 20.0 - 45.0 kg/m2

Exclusion Criteria:

• Type 1 diabetes mellitus patients
• Serum creatinine > upper limit of normal
• Proteinuria (albumin/creatinine ratio > 300mg/g)
• Dysuria and/or urinary tract infection, genital infection
• Significant renal, hepatic or cardiovascular diseases
• Severe gastrointestinal diseases