GLP1R and type 2 diabetes mellitus: To date, no treatment is available for WS, although there are some promising drugs against the progression of WS—two of which are the glucagon-like peptide-1 receptor (GLP-1R) agonist liraglutide (LIR), used for the treatment of type 2 diabetes [4,5], and mood stabilizer valproic acid (VPA).