MTOR and breast cancer: The transfer of miR-100 via MSC-derived exosomes in cancer cells determines the down-regulation of VEGFA secretion by directly targeting mammalian target of rapamycin (mTOR) and modulating mTOR/HIF-1α axis, in fact the miR-100 up-regulation could inhibit angiogenesis and endothelial cell proliferation in the BC microenvironment [174].