DDX39A and hepatocellular carcinoma: As 39A_I6 and 39A_S were highly expressed in HCC cells (Figure 3d) and 39A_S was the only isoform encoding the DDX39A protein, for the following experiments, we focused only on investigating long isoform 39A_I6 (named 39A_L) and the short isoform 39A_S.