C-peptide response to glucagon challenge is correlated with improvement of early insulin secretion by liraglutide treatment

The amelioration of glucose tolerance by liraglutide was associated with a significant improvement of early insulin-response during OGTT. The serum C-peptide response to glucagon challenge strongly correlated with the improvement of the early insulin-response. The C-peptide response to glucagon challenge would be useful to predict therapeutic response to liraglutide.