“…With the recent development of isolation methods of exosomes and the applications of protein spectrum, the roles of exosome proteins in the diagnosis, prognosis, and treatment of diseases have been demonstrated in many medical fields, especially for cancer [4]. Exosomal proteins include (1) Membrane transport and fusion-related proteins, such as annexin (Anx II), Rab-GTPase, and heat shock proteins (HSPs), including Hsp60, Hsp70, and Hsp90; (2) Four-transmembrane cross-linked proteins, namely CD9, CD63, CD81, CD82, CD106, Tspan8, intercellular adhesion molecule-1 (ICAM-1); (3) Multi-vesicular bodies (MVBs)-related proteins, for instance, ALIX and TSG101; (4) Other proteins, like integrins, actin, and myosin [5].…”