LAMA4 encodes laminin subunit alpha 4, a critical extracellular matrix component that forms trimeric laminin complexes (laminin-411, -421, -423) in basement membranes and synapses 1. The protein serves as a structural constituent of the extracellular matrix and mediates cell-matrix interactions through high-affinity receptors. In pancreatic islet endothelial cells, LAMA4 functions as a structural gene alongside other basement membrane components 1. The protein plays crucial roles in cancer biology through multiple mechanisms. In glioblastoma, LAMA4 is released from migrasomes to promote tumor cell migration and invasion 2. In hepatocellular carcinoma, LAMA4 overexpression correlates with poor disease-free survival 3, while cancer-associated fibroblasts secrete LAMA4 to recruit CD8+ T cells and inhibit their function through ITGA6-mediated DNA damage signaling 4. In hematopoietic malignancies, LAMA4 acts as a tumor suppressor - its deletion accelerates acute myeloid leukemia progression by altering bone marrow niche composition and promoting chemoresistance 5. LAMA4 also contributes to breast cancer brain metastasis through FAK-NF-κB signaling pathways 6 and colorectal cancer liver metastasis via COL1A1-CD44 and LAMA4-CD44 signaling axes 7. These findings establish LAMA4 as having context-dependent roles in cancer progression.