No significant impact of DPP4 inhibition on fasting plasma glucose ( 5.10.1 vs 4.90.1 mmol/l , P = 0.3 ) , glucose tolerance ( area under the curve ( AUC ) for plasma glucose , 15135 vs 13726mmol/lmin , P = 0.7 ) or peak plasma glucose during OGTT ( 8.50.4 vs 8.10.3 mmol/l , P = 0.3 ) was observed .