CD44 and breast cancer: The same group use Liquid Chromatography (MALDI-TOF/TOF-MS) and identified 353 proteins in BC derived exosomes, including members of ESCRT family, HSP (hsp70, hsp90), cytoskeletal elements (actin, myosin, and cytokeratins), and a wide array of transmembrane proteins (integrins, EGF-R, CD44, mucin-1, and syndecan).