ATP2C2 and cholangiocarcinoma: Among them, five lncRNAs (AL360178.1, CDKN2B-AS1, ZNF667-AS1, AJ003147.1, and CNNM3-DT) were protective factors for CC patients, while two lncRNAs (ATP2C2-AS1 and BAIAP2-DT) were risk factors.