In this study, we found that RBM23 was highly expressed in hepatocellular carcinoma (HCC) and correlated with tumor microvessel density (as indicated by CD31-positive cells), suggesting that RBM23 may be involved in the formation of microvessels in HCC and promote the proliferation and distant metastasis of HCC. Here, PECAM1 is linked to hepatocellular carcinoma.