PCDH9 and hepatocellular carcinoma: This pro-metastatic effect is mediated through the RNF145-driven ubiquitination and subsequent degradation of protocadherin 9 (PCDH9).<h4>Conclusion</h4>Our findings confirm the significant upregulation of RNF145 in HCC and promote metastasis by facilitating PCDH9 ubiquitination and degradation, highlighting its role as a prognostic biomarker and a potential therapeutic target.