PIK3CB and pancreatic ductal adenocarcinoma: The hsa_circ_0084003 was upregulated in non-small cell lung cancer and was a miR-381-3p sponge to block its inhibitory effects on C–X–C motif chemokine receptor 4, thus promoting tumor cell immune evasion [50], and promoted pancreatic ductal adenocarcinoma progression by targeting miR-532-3p/PIK3CB [51].