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Medline ® Abstract for Reference 25

of 'Treatment of relapsed or refractory acute lymphoblastic leukemia in adults'

Allogeneic T Cells That Express an Anti-CD19 Chimeric Antigen Receptor Induce Remissions of B-Cell Malignancies That Progress After Allogeneic Hematopoietic Stem-Cell Transplantation Without Causing Graft-Versus-Host Disease.
Brudno JN, Somerville RP, Shi V, Rose JJ, Halverson DC, Fowler DH, Gea-Banacloche JC, Pavletic SZ, Hickstein DD, Lu TL, Feldman SA, Iwamoto AT, Kurlander R, Maric I, Goy A, Hansen BG, Wilder JS, Blacklock-Schuver B, Hakim FT, Rosenberg SA, Gress RE, Kochenderfer JN
J Clin Oncol. 2016 Apr;34(10):1112-21. Epub 2016 Jan 25.
PURPOSE: Progressive malignancy is the leading cause of death after allogeneic hematopoietic stem-cell transplantation (alloHSCT). After alloHSCT, B-cell malignancies often are treated with unmanipulated donor lymphocyte infusions (DLIs) from the transplant donor. DLIs frequently are not effective at eradicating malignancy and often cause graft-versus-host disease, a potentially lethal immune response against normal recipient tissues.
METHODS: We conducted a clinical trial of allogeneic T cells genetically engineered to express a chimeric antigen receptor (CAR) targeting the B-cell antigen CD19. Patients with B-cell malignancies that had progressed after alloHSCT received a single infusion of CAR T cells. No chemotherapy or other therapies were administered. The T cells were obtained from each recipient's alloHSCT donor.
RESULTS: Eight of 20 treated patients obtained remission, which included six complete remissions (CRs) and two partial remissions. The response rate was highest for acute lymphoblastic leukemia, with four of five patients obtaining minimal residual disease-negative CR. Responses also occurred in chronic lymphocytic leukemia and lymphoma. The longest ongoing CR was more than 30 months in a patient with chronic lymphocytic leukemia. New-onset acute graft-versus-host disease after CAR T-cell infusion developed in none of the patients. Toxicities included fever, tachycardia, and hypotension. Peak blood CAR T-cell levels were higher in patients who obtained remissions than in those who did not. Programmed cell death protein-1 expression was significantly elevated on CAR T cells after infusion. Presence of blood B cells before CAR T-cell infusion was associated with higher postinfusion CAR T-cell levels.
CONCLUSION: Allogeneic anti-CD19 CAR T cells can effectively treat B-cell malignancies that progress after alloHSCT. The findings point toward a future when antigen-specific T-cell therapies will play a central role in alloHSCT.
Jennifer N. Brudno, Robert P.T. Somerville, Victoria Shi, Jeremy J. Rose, David C. Halverson, Daniel H. Fowler, Juan C. Gea-Banacloche, Steven Z. Pavletic, Dennis D. Hickstein, Tangying L. Lu, Steven A. Feldman, Alexander T. Iwamoto, Brenna G. Hansen, Bazetta Blacklock-Schuver, Frances T. Hakim, Steven A. Rosenberg, Ronald E. Gress, and James N. Kochenderfer, National Cancer Institute; Roger Kurlander and Irina Maric, National Institutes of Health, Bethesda; Jennifer S. Wilder, Frederick National Laboratory for Cancer Research, Frederick, MD; and Andre Goy, John Theurer Cancer Center at Hackensack University Medical Center, Hackensack, NJ.