GCG and Hypoplastic pancreas-intestinal atresia-hypoplastic gallbladder syndrome: Recently, congenital glucagon-like peptide-1 (GLP-1) deficiency was identified in several Mitchell-Riley syndrome patients, suggesting a potential pathogenic explanation for the diarrhea; synthetic GLP-1 analog liraglutide was administered, resulting in diarrhea improvement in all patients, with no effect on glycemic status (Nóbrega et al. 2021).