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Most cancer tissues displayed weak to moderate cytoplasmic positivity. Lymphoma, melanoma, carcinoid, skin, testis, renal and hepatocellular carcinomas were negative in several cases.
Several gastric and endometrial cancers along with a few cases of most carcinomas showed moderate to strong cytoplasmic staining with a granular pattern. Gliomas, lymphomas and melanomas along with breast cancers were negative.
The protein encoded by this gene belongs to the laminin family of secreted molecules. Laminins are heterotrimeric molecules that consist of alpha, beta, and gamma subunits that assemble through a coiled-coil domain. Laminins are essential for formation and function of the basement membrane and have additional functions in regulating cell migration and mechanical signal transduction. This gene encodes an alpha subunit and is responsive to several epithelial-mesenchymal regulators including keratinocyte growth factor, epidermal growth factor and insulin-like growth factor. Mutations in this gene have been identified as the cause of Herlitz type junctional epidermolysis bullosa and laryngoonychocutaneous syndrome. Alternative splicing and alternative promoter usage result in multiple transcript variants. [provided by RefSeq, Dec 2014]