Safety, Tolerance and Activity of HE3286 in Patients With Type 2 Diabetes Mellitus

Main Inclusion Criteria: * Patient with a diagnosis of Type 2 Diabetes Mellitus (T2DM) * Patient must be a) on a stable dose of metformin as monotherapy for at least 10 weeks prior to screening; or b) drug-naive, defined as never having received drug treatment for T2DM or not having received antidiabetic drug therapy during the 3 months prior to screening. * Patient with a fasting blood glucose level of ≤ 225 mg/dL at screening (≤ 255 mg/dl for drug-naive patients); * Patient with HbA1c levels \>7.5% (7.0 - 10.5% for drug-naive patients) at screening; * Patient with BMI 28-37 kg/m2 for females 28-39 kg/m2 for males Main Exclusion Criteria: * Patient who has a history of clinically significant cardiovascular disease (including coronary artery disease), clinically significant hepatic, respiratory or renal abnormalities within 6 months prior to screening; * Patient with unstable diabetic complications requiring treatment or ongoing active intervention; * Patient with a history of long term insulin therapy within the past year; * Patient who has had therapy with rosiglitazone, pioglitazone, exendin-4 or sitagliptin, alone or in combination within 6 months prior to screening; * Patient who has any clinically significant abnormalities in laboratory results at screening;