LAMA3 encodes the alpha-3 chain of laminin-332, a critical extracellular matrix protein with multifaceted biological roles. Structurally, LAMA3 functions as a basement membrane component that mediates cell adhesion through integrin α3β1 in focal adhesions and integrin α6β4 in hemidesmosomes, while also promoting signal transduction via tyrosine phosphorylation 1. During development, LAMA3 is ubiquitously expressed in epithelial tissues and plays essential roles in organoid formation, where epithelial cells secrete laminin-rich basement membranes containing LAMA3 that function as de novo stem cell niches 2. LAMA3 is also critical for glomerulogenesis, with targeted disruption causing maturation arrest of glomerular endothelial cells and preventing mesangial cell migration 3. Clinically, LAMA3 mutations cause junctional epidermolysis bullosa, a severe blistering disorder, and a missense mutation (R217C) is associated with androgenetic alopecia in mice 4. In cancer biology, LAMA3 expression varies by tumor type: elevated LAMA3 correlates with poor prognosis and enhanced proliferation, migration, and invasion in pancreatic adenocarcinoma, gastric adenocarcinoma, and esophageal squamous cell carcinoma 567. LAMA3's pro-tumoral effects involve ECM-receptor interactions and PI3K-Akt signaling pathways, positioning it as a potential biomarker and therapeutic target across multiple malignancies.