The secondary objectives are to assess the effects of lixisenatide on the maximum PPG excursion, and on the changes in insulin, pro-insulin, C-peptide and glucagon plasma concentrations following a standardized breakfast, 24-hour profile of plasma glucose, glycosylated hemoglobin (HbA1c), satiety markers (obestatin, peptide YY [PYY3-36] and oxyntomodulin); and to assess the clinical and laboratory safety profile.