Initial Combination With Pioglitazone Study (0431-064)

Patients will receive initial combination therapy with blinded sitagliptin 100 mg q.d. and open- label pioglitazone 30 mg q.d. for up to 24 Weeks. Sitagliptin 100 mg q.d. and pioglitazone 30 mg q.d. will be administered as oral tablets.

Patients will receive placebo to match sitagliptin 100 mg q.d. (blinded) and open label pioglitazone 30 mg q.d. for up to 24 Weeks. Placebo to match sitagliptin 100 mg q.d.(blinded) and open-label pioglitazone 30 mg q.d. will be administered as oral tablets.