TGFB1 and neoplasm: EVs not only play a role in metastasis and drug resistance but also in immune suppression and angiogenesis, and also, by providing growth factors such as transforming growth factor‐β (TGF‐β) and various miRNAs, they can convert mesenchymal stem cells (MSCs) and other bone marrow‐derived cells into tumor‐supporting cells.25, 34, 35