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Medline ® Abstract for Reference 103

of 'Treatment of relapsed or refractory chronic lymphocytic leukemia'

Engineered T cells for the adoptive therapy of B-cell chronic lymphocytic leukaemia.
Koehler P, Schmidt P, Hombach AA, Hallek M, Abken H
Adv Hematol. 2012;2012:595060. Epub 2011 Aug 8.
B-cell chronic lymphocytic leukaemia (B-CLL) remains an incurable disease due to the high risk of relapse, even after complete remission, raising the need to control and eliminate residual tumor cells in long term. Adoptive T cell therapy with genetically engineered specificity is thought to fulfil expectations, and clinical trials for the treatment of CLL are initiated. Cytolytic T cells from patients are redirected towards CLL cells by ex vivo engineering with a chimeric antigen receptor (CAR) which binds to CD19 on CLL cells through an antibody-derived domain and triggers T cell activation through CD3ζupon tumor cell engagement. Redirected T cells thereby target CLL cells in an MHC-unrestricted fashion, secret proinflammatory cytokines, and eliminate CD19(+) leukaemia cells with high efficiency. Cytolysis of autologous CLL cells by patient's engineered T cells is effective, however, accompanied by lasting elimination of healthy CD19(+) B-cells. In this paper we discuss the potential of the strategy in the treatment of CLL, the currently ongoing trials, and the future challenges in the adoptive therapy with CAR-engineered T cells.
Department I of Internal Medicine, and Center for Molecular Medicine Cologne, University Hospital Cologne, Robert-Koch-Strasse 21, 50931 Cologne, Germany.