LAMB3 (laminin subunit beta 3) encodes a critical component of laminin-332, a basement membrane protein essential for epithelial-mesenchymal organization and cell adhesion 1. As part of the laminin heterotrimer, LAMB3 mediates cell attachment, migration, and tissue development through interactions with integrin receptors and other extracellular matrix components 2. LAMB3 is ubiquitously expressed in epithelial tissues and plays pivotal roles in wound healing; SNHG26-mediated relocation of transcription factor ILF2 to the LAMB3 locus drives keratinocyte progenitors from inflammatory to proliferative states during repair 3. Functionally, LAMB3 promotes cell adhesion and integrin-FAK-Src signaling; extracellular LAMB3 interacts with PCMT1 to enhance focal adhesion dynamics and cancer cell migration 4. Disease relevance is substantial: LAMB3 mutations cause junctional epidermolysis bullosa and amelogenesis imperfecta through loss-of-function mechanisms 51. Conversely, LAMB3 is frequently overexpressed in squamous cell carcinomas (skin, thyroid, lung, pancreatic, ovarian, colorectal, gastric, breast, cervical, nasopharyngeal, bladder, prostate) and serves as a prognostic marker; elevated LAMB3-ITGA2 interactions correlate with reduced relapse-free survival in papillary thyroid carcinoma 671. Thus LAMB3 functions as both a basement membrane structural protein and a context-dependent oncogenic factor, representing a promising therapeutic target across multiple disease contexts.