STAT3 and intrahepatic cholangiocarcinoma: For instance, the biogenesis of circRNA GGNBP2 (cGGNBP2) was mediated by IL-6/STAT3 pathway activation, and IL-6/cGGNBP2-184aa (a protein encoded by cGGNBP2)/STAT3 formed a positive feedback loop to promote tumor progression for intrahepatic cholangiocarcinoma.