NEDD9 is a multi-domain scaffolding protein that serves as a central coordinator for tyrosine kinase-based signaling in cell adhesion and migration 1. In normal physiology, NEDD9 promotes lymphocyte adhesion and migration to secondary lymphoid organs 2, regulates T-cell receptor organization at the immunological synapse, and modulates cilia disassembly through AURKA-mediated HDAC6 phosphorylation 3. In cancer pathology, NEDD9 expression is significantly elevated across multiple tumor types and represents a critical prognostic marker. Meta-analysis of 27 studies demonstrated that elevated NEDD9 expression associates with poor overall survival (HR: 1.81) and reduced progression-free/disease-free survival (HR: 2.14) 4. NEDD9 promotes tumor-intrinsic oncogenic signaling through FAK/NF-κB and STAT3 pathways, driving epithelial-mesenchymal transition, invasion, and metastasis 56. Additionally, NEDD9 modulates the tumor microenvironment by promoting macrophage M2 polarization 5. Genetic studies identify NEDD9 rs760678 polymorphism as protective against Alzheimer's disease in Caucasians 7. Clinically, NEDD9 shows promise as a neural-associated biomarker for hepatocellular carcinoma prognosis 8, while emerging evidence suggests NEDD9 involvement in polycystic kidney disease and stroke 9.