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Focal adhesion kinase and its potential involvement in tumor invasion and metastasis

Integrins are cell surface receptors which, in part, mediate the adhesion of cells to the extracelluar matrix. In addition to providing a molecular “glue” essential for tissue organization and survival, integrins are dynamic signaling molecules. Integrins allow normal, nontransformed cells to sense that they are adhered to the extracellular matrix, thus providing a cell survival signal. This signal allows cells to proliferate in the presence of growth factors and in some instances prevents apoptosis. Integrins also mediate cell migration as it occurs in normal processes such as angiogenesis, wound healing, immune system function, and development. Aberrances in the expression and function of integrins contribute to many disease states including cancer.