GAB2 is a cytoplasmic adapter protein that functions as a molecular scaffold linking membrane receptors to intracellular signaling pathways 1. Lacking intrinsic catalytic activity, GAB2 becomes phosphorylated by protein-tyrosine kinases and recruits SH2 domain-containing proteins including SHP2, PI3K p85, PLCγ, and Crk 1. This scaffolding facilitates downstream signaling cascades including PI3K/AKT and ERK/MAPK pathways that regulate cell growth, differentiation, migration, and apoptosis 2. GAB2 mediates osteoclast differentiation through RANK signaling and regulates mast cell degranulation in allergic responses 1. Clinically, GAB2 dysregulation associates with multiple malignancies. GAB2 is recurrently amplified in lung adenocarcinoma and ovarian cancer, with overexpression capable of transforming immortalized cell lines 3. Recent evidence indicates GAB2 overexpression accelerates acute myeloid leukemia progression by facilitating survival of transformed cells, potentially preceding signaling mutations 4. GAB2 genetic variants (rs2373115) associate with Alzheimer's disease susceptibility, particularly in white populations 5, 6. These findings identify GAB2 as both an oncogene and disease-associated locus with therapeutic potential through disruption of its scaffolding function or upstream signaling interactions.