For example, B lymphocytes and dendritic cells (DCs) secrete exosomes that carry major histocompatibility complex (MHC) class-I and class-II [19] and exosomes from activated T cells contain bioactive Fas ligand (FasL) that can induce apoptosis of T cells [20]; some tumor exosomes carry adhesion molecules, metalloproteinases, and tissue-specific proteins associated with tumorigenesis and metastasis [21-23]. Here, FASLG is linked to neoplasm.