SNAI1 and lung cancer: Exosome-mediated transfer of miRNAs (including miR-193a-3p, miR-210-3p, and miR-5100) from bone marrow mesenchymal stem cells to epithelial cancer cells activates signal transducer and activator of transcription 3 (STAT3) signaling and increases the expression of mesenchymal-associated molecules (Snail and VIM), induces EMT, and promotes invasion of lung cancer cells (115).