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Hematology 2004
© 2004 The American Society of Hematology

Immunotherapeutic Approaches for Hematologic Malignancies

Michael A. Caligiuri, Andrea Velardi, David A. Scheinberg and Ivan M. Borrello

Abstract

The immune system has two complementary arms: one is older and seemingly more primitive, called the innate immune system, found in both plants and animals. The second (already many millions of years old!) is the adaptive or antigen-specific immune system, limited to vertebrate animals. The human innate immune system has many cellular elements that include granulocytes, monocytes, macrophages, natural killer (NK) cells, mast cells, eosinophils, and basophils. Receptors for these cells are non-clonal, fixed in the genome, requiring no rearrangement, and recognize conserved molecular patterns that are specific to pathogens. The adaptive immune system (B cells and T cells) have receptors with great variation, able to recognize an almost an unlimited number of highly specific pathogens through rearrangement of receptor gene segments, and can also provide immunological memory so critical for vaccination. As the immune system has evolved to recognize non-self, malignant transformation of self can likely escape immune surveillance with relative ease. Contributors to this chapter are utilizing distinct components of either the innate or adaptive immune system that recognize non-self, in combination with what we know about differences between malignant and normal self, in an effort to develop novel and effective immunologic approaches against hematologic malignancies.

In Section I, Dr. Andrea Velardi reviews the benefits of NK cell alloreactivity in mismatched hematopoietic transplantation, provides updates on current clinical trials, and discusses further therapeutic perspectives emerging from murine bone marrow transplant models.

In Section II, Dr. David Scheinberg reviews novel leukemic antigens being targeted by humanized monoclonal antibodies as well as mechanisms by which antibody-mediated cytotoxicity occurs in vivo.

In Section III, Dr. Ivan Borrello reviews vaccine and adoptive T cell immunotherapy in the treatment of hematologic malignancies. Specifically, he discusses the various vaccine approaches used as well as strategies aimed at augmenting the tumor specificity of T cell therapies.


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Copyright © 2004 by the American Society of Hematology.