Disclosed are means, methods and compositions of matter useful for amplification of adaptive immune responses towards neoplastic tissue. In one embodiment, immunization of a patient is performed by a means comprising of administering either an exogenous vaccine or stimulation of immunogenicity of the tumor so as to cause release of antigens/increased exposure of antigens, thus resulting in an endogenous vaccine. Subsequent to vaccination a patient is treated by an immunopheresis procedure, in order to allow for removal of blocking factors produced by the tumor or produced by cells programmed by tumors to produce said blocking factors. In one embodiment further immunization is performed subsequent to removal of said blocking factors in order to allow for enhancement of adaptive immune responses

Disclosed are means of stimulating innate and/or adaptive immunity to cancer by administration of exosomes. Stimulation of innate immunity involves modifying exosomes by chemical addition of innate immune stimulators, whereas stimulation of adaptive immunity involves pulsing dendritic cells generating exosomes with antigens, in some cases, pulsing with Brother of the Regulator of Imprinted Sites (BORIS) proteins, peptides, or altered peptide ligands thereof.