FGFR1 and pancreatic ductal adenocarcinoma: This notion has been supported by a series of previous studies: circPVT1 functions as an oncogene to promote metastasis via miR-145 sponging in CRC10; circPDE8A promotes the invasive growth of pancreatic ductal adenocarcinoma cells by antagonizing miR-338 to enhance the MET pathway11; and fibroblast growth factor receptor 1 (FGFR1) derived circular RNA circFGFR1 promotes non-small cell lung cancer progression and resistance to immune checkpoint inhibitor therapy via miR-381-3p/CXCR4 axis12.