Journal
SEMINARS IN ONCOLOGY
Volume 41, Issue 5, Pages 667-677Publisher
W B SAUNDERS CO-ELSEVIER INC
DOI: 10.1053/j.seminoncol.2014.08.006
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Funding
- Jonsson Comprehensive Cancer Center at UCLA
- Fundamental and Clinical Immunology Training Grant [AI07126-23]
- UCLA AIDS Institute
- Fogarty International Center Fellowship [D43 TW00013]
- UC MEXUS-CONACYT
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Antibody-mediated immunotherapy has gained significant momentum since 1997 when the US Food and Drug Administration approved the first monoclonal antibody (mAb) for the treatment of B-cell non-Hodgkin lymphoma (B-NHL), namely, rituximab (chimeric. anti-CD20 mAb). Subsequently, more than 20 approved mAbs have been in use clinically for the treatment of various cancers and several non-cancer related diseases. Further, the combination treatment of mAbs with chemotherapy, immunotherapy, proteaosome inhibitors, and other inhibitors has resulted in synergistic anti-tumor activity with significant objective clinical responses. Despite their successful clinical use, the underlying mechanisms of rituximab's in vivo activities remain elusive. Further, it is not clear why a subset of patients is initially unresponsive and many responding patients become refractory and resistant to further treatments; hence, the underlying mechanisms of resistance are not known, Attempts have been made to develop model systems to investigate resistance to mAb therapy with the hope to apply the findings in both the generation of new therapeutics and in their use as new prognostic biomarkers. This review focuses on the development of resistance to rituximab treatments and discusses possible underlying mechanisms of action, postulated mechanisms of resistance in model systems, and suggested means to overcome resistance. Several prior reviews on the subject of rituximab resistance have been published and the present review both complements as well as adds new topics of relevance. (C) 2014 Elsevier Inc. All rights reserved.
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