Abstract
Transforming growth factor-β (TGF-β) is a multifunctional cell factor, which can inhibit the growth of most normal cells and cancer cells. Smad4 is a intracellular mediator of TGF-β, and it conducts TGF-β signal from cell membrane to the nucleus, and regulates transcriptions of the target genes. Researches have revealed that abnormal expression of Smad4 could cause precancerous diseases, induce carcinogenesis, and influence the biological features of tumor cells.
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