PCNA and esophageal squamous cell carcinoma: In line with our previous results, the knockdown of PCNA-AS1 led to the downregulation of PCNA; however, co-transfection of the miR-2467-3p inhibitor and sh-PCNA-AS1 recovered PCNA expression (Figure 6a), and abolished the biological efficacy of sh-PCNA-AS1 on ESCC cell viability, migration, clone formation and invasion abilities (Figure 6b–e).