CDK4 and cancer: Correlation analysis showed that the abundance of LINC01134 in PDAC tissues was positively correlated with the levels of cyclin and cyclin-dependent kinases (Cyclin D1, Cyclin E, CDK2, CDK4) and cancer stem cell master genes (CD133, OCT4, NANOG, and Sox2) (Fig. 1E), and this result was more representative compared with the other four lncRNAs (Fig. S1A).