MEX3A is a dual-function RNA-binding protein containing both KH domains for RNA binding and a RING domain with E3 ubiquitin ligase activity 1. The protein exhibits oncofetal expression patterns, being downregulated postnatally but re-expressed in various malignancies 1. MEX3A functions through multiple mechanisms including post-transcriptional regulation of mRNA stability and translation, as well as targeted protein degradation 2. In ovarian cancer, MEX3A promotes tumorigenesis by mediating p53 protein degradation, which suppresses ferroptosis and enhances tumor growth 3. The protein activates oncogenic signaling pathways including RAP1/MAPK in colorectal cancer 4 and RORA/β-catenin in hepatocellular carcinoma 5. MEX3A also forms liquid-liquid phase separation complexes with circRNAs like circMPP6 to regulate processing body dynamics and mRNA decay 6. Clinically, MEX3A overexpression correlates with poor prognosis across multiple cancer types including colorectal, ovarian, thyroid, hepatocellular carcinomas, and glioblastoma 43758. Its diagnostic accuracy and independent prognostic value make MEX3A a promising biomarker and therapeutic target for precision oncology 28.