RBFOX2 is an RNA-binding protein that regulates alternative splicing by recognizing specific RNA sequence motifs, particularly 5'-UGCAUGU-3' elements 1. Beyond classical splicing regulation, RBFOX2 functions as a multifaceted regulatory factor with diverse biological roles. It acts as a chr22-associated RNA reader, recognizing N6-methyladenosine (m6A) modifications and recruiting methyltransferase complexes to regulate transcription 2. RBFOX2 also facilitates m5C-to-5hmC conversion on chr22-associated RNAs, contributing to mRNA degradation 3. In cancer contexts, RBFOX2 acts as a potent tumor suppressor. Its overexpression dramatically reduces metastatic potential in pancreatic ductal adenocarcinoma by regulating splicing of RHO GTPase pathway genes, particularly MPRIP, which controls cytoskeletal organization 4. Downregulation of RBFOX2 promotes pancreatic cancer progression through altered splicing of cytoskeletal remodeling genes like ABI1 5. In glioblastoma, FBXO7-mediated stabilization of RBFOX2 confers mesenchymal properties and chemoresistance by controlling FoxM1 splicing 6. In acute myeloid leukemia, RBFOX2 is essential for leukemia stem cell maintenance and patient survival 2. Clinically, de novo RBFOX2 mutations are associated with congenital heart disease, neurodevelopmental disabilities, and multiple congenital anomalies 7, suggesting developmental roles in cardiac and neurological systems.