PTGDR and hepatocellular carcinoma: In order to discuss the effect of FOXP4-AS1 on the biological functions of HCC cells, some assays were adopted and the results displayed that by comparison with the sh-FOXP4-AS1-1 + sh-CTR group, the proliferation, invasion, colony formation, and migration were elevated, as well as apoptosis were reduced in the sh-FOXP4-AS1-1 + sh-ZC3H12D group (all P < 0.05) (Fig. 6A–L).