TGFB1 and breast carcinoma: Exosomes derived from breast carcinomas, for instance, were shown to be taken up by bone marrow cells and to switch the differentiation pathways of these cells toward MDSCs via Prostaglandin E2 and TGF-β, promoting accumulation of COX2, IL6, VEGF and Arginase1 by MDSCs (Xiang et al., 2009).