TGFB1 and cancer: Previous studies have produced considerable conceptual advances regarding: (1) the regulation of miRNA expression by TGF-β signaling; (2) the modulation of TGF-β signaling by miRNAs; (3) the miRNA-mediated regulation of cell state transitions, which include EMT and EndMT; and (4) the crosstalk between miRNA and TGF-β pathways in cancer.