Mutations in the genes isocitrate dehydrogenases (IDH1 and 2) and fusions of the fibroblast growth factor receptor 2 (FGFR2) were found exclusively in iCCA, whereas Kirsten rat sarcoma viral oncogene homolog (KRAS) were more common in eCCA [32]. This evidence concerns the gene FGFR2 and infantile convulsions and choreoathetosis.