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lüll Metastasis suppressor proteins: discovery, molecular mechanisms, and clinical application Rinker-Schaeffer CW; O'Keefe JP; Welch DR; Theodorescu DClin Cancer Res 2006[Jul]; 12 (13): 3882-9Clinically and experimentally, primary tumor formation and metastasis are distinct processes - locally growing tumors can progress without the development of metastases. This observation prompted the hypothesis that the molecular processes regulating tumorigenicity and metastasis are distinguishable and could be targeted therapeutically. During the process of transformation and subsequent progression to a malignant phenotype, both genetic and epigenetic alterations alter a cell's ability to perceive and respond to signals that regulate normal tissue homeostasis. A minority of tumorigenic cells accrue the full complement of alterations that enables them to disseminate from the primary tumor, survive insults from the immune system and biophysical forces, and respond to growth-promoting and/or inhibitory signals from the distant tissues and thrive there. Identification of genes and proteins that specifically inhibit the ability of cells to form metastases (e.g., metastasis suppressors) is providing new insights into the molecular mechanisms that regulate this complex process. This review will highlight: (a) the functional identification of metastasis suppressors, (b) the signaling cascades and cellular phenotypes which are controlled or modulated by metastasis suppressors, and (c) op portunities for translation and clinical trials that are based on mechanistic studies regarding metastasis suppressors.|Animals[MESH]|Humans[MESH]|Models, Immunological[MESH]|Signal Transduction/immunology[MESH]|Tumor Suppressor Proteins/*immunology[MESH] |