In addition, through analysis of PTBP1 expression in liver cancer patient database, the results of the UALCAN database show that in hepatocellular carcinoma (HCC), compared with normal (N = 50), the expression of PTBP1 increased in the primary tumor (N= 371), and the expression of Axl decreased significantly (Figure S3A). Here, PTBP1 is linked to liver cancer.