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Mol Ther Oncolytics. 2020 Jun 24;18:171-188. doi: 10.1016/j.omto.2020.06.011. eCollection 2020 Sep 25.

Autologous Transplantation Using Donor Leukocytes Loaded .

Molecular therapy oncolytics

Nancy Y Villa, Masmudur M Rahman, Joseph Mamola, Julia D'Isabella, Elizabeth Goras, Jacquelyn Kilbourne, Kenneth Lowe, Juliane Daggett-Vondras, Lino Torres, John Christie, Nicole Appel, Anna L Cox, Jae B Kim, Grant McFadden

Affiliations

  1. Biodesign Institute, Center for Immunotherapy, Vaccines and Virotherapy (CIVV), Arizona State University, Tempe, AZ 85281, USA.
  2. PerkinElmer Inc., Waltham, MA 02451, USA.

PMID: 32695875 PMCID: PMC7364119 DOI: 10.1016/j.omto.2020.06.011

Abstract

Multiple myeloma (MM) is a hematological malignancy of monoclonal plasma cells that remains incurable. Standard treatments for MM include myeloablative regimens and autologous cell transplantation for eligible patients. A major challenge of these treatments is the relapse of the disease due to residual MM in niches that become refractory to treatments. Therefore, novel therapies are needed in order to eliminate minimal residual disease (MRD). Recently, our laboratory reported that virotherapy with oncolytic myxoma virus (MYXV) improved MM-free survival in an allogeneic transplant mouse model. In this study, we demonstrate the capacity of donor autologous murine leukocytes, pre-armed with MYXV, to eliminate MRD in a BALB/c MM model. We report that MYXV-armed bone marrow (BM) carrier leukocytes are therapeutically superior to MYXV-armed peripheral blood mononuclear cells (PBMCs) or free virus. Importantly, when cured survivor mice were re-challenged with fresh myeloma cells, they developed immunity to the same MM that had comprised MRD.

© 2020 The Author(s).

Keywords: autologous stem cells transplantation (ASCT); carrier cells; minimal residual disease (MRD); multiple myeloma (MM); myxoma virus (MYXV); tumor micreoenvironment (TME)

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