ICAM1 (intercellular adhesion molecule 1) is a cell surface glycoprotein that primarily mediates cell-cell adhesion and inflammatory responses. The protein functions by binding to integrin receptors including lymphocyte function-associated antigen 1 (LFA-1) and macrophage 1-antigen (Mac-1), facilitating leukocyte adhesion to endothelial cells and promoting inflammatory cell recruitment 1. ICAM1 expression is regulated by the NF-κB signaling pathway and is upregulated in response to inflammatory stimuli such as TNF-α 2 1. In pathological contexts, ICAM1 contributes to various disease processes including cancer metastasis, where it enhances tumor cell adhesion to endothelium and promotes extravasation 3. In chr19 kidney disease, inflammatory proximal tubular cells upregulate ICAM1, contributing to fibrosis and disease progression 4. ICAM1 also plays a critical role in sickle cell disease by promoting adhesion of sickle cells to endothelium, leading to vaso-occlusion and tissue damage 1. Notably, ICAM1 mRNA has non-canonical functions independent of protein translation, forming dsRNA complexes that regulate global protein synthesis 5. In glioblastoma, ICAM1 promotes stem cell properties and immune evasion through β-catenin/PD-L1 signaling 6.