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      Regression of Glioblastoma after Chimeric Antigen Receptor T-Cell Therapy.

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          Abstract

          A patient with recurrent multifocal glioblastoma received chimeric antigen receptor (CAR)-engineered T cells targeting the tumor-associated antigen interleukin-13 receptor alpha 2 (IL13Rα2). Multiple infusions of CAR T cells were administered over 220 days through two intracranial delivery routes - infusions into the resected tumor cavity followed by infusions into the ventricular system. Intracranial infusions of IL13Rα2-targeted CAR T cells were not associated with any toxic effects of grade 3 or higher. After CAR T-cell treatment, regression of all intracranial and spinal tumors was observed, along with corresponding increases in levels of cytokines and immune cells in the cerebrospinal fluid. This clinical response continued for 7.5 months after the initiation of CAR T-cell therapy. (Funded by Gateway for Cancer Research and others; ClinicalTrials.gov number, NCT02208362 .).

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          Engraftment of human central memory-derived effector CD8+ T cells in immunodeficient mice.

          Xiuli Wang, Carolina Berger, ChingLam W Wong … (2011)
          In clinical trials of adoptive T-cell therapy, the persistence of transferred cells correlates with therapeutic efficacy. However, properties of human T cells that enable their persistence in vivo are poorly understood, and model systems that enable investigation of the fate of human effector T cells (T(E)) have not been described. Here, we analyzed the engraftment of adoptively transferred human cytomegalovirus pp65-specific CD8(+) T(E) cells derived from purified CD45RO(+)CD62L(+) central memory (T(CM)) or CD45RO(+)CD62L(-) effector memory (T(EM)) precursors in an immunodeficient mouse model. The engraftment of T(CM)-derived effector cells (T(CM/E)) was dependent on human interleukin-15, and superior in magnitude and duration to T(EM)-derived effector cells (T(EM/E)). T-cell receptor Vβ analysis of persisting cells demonstrated that CD8(+) T(CM/E) engraftment was polyclonal, suggesting that the ability to engraft is a general feature of T(CM/E.) CD8(+) T(EM/E) proliferated extensively after transfer but underwent rapid apoptosis. In contrast, T(CM/E) were less prone to apoptosis and established a persistent reservoir of functional T cells in vivo characterized by higher CD28 expression. These studies predict that human CD8(+) effector T cells derived from T(CM) precursors may be preferred for adoptive therapy based on superior engraftment fitness.
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            Phenotypic and functional attributes of lentivirus-modified CD19-specific human CD8+ central memory T cells manufactured at clinical scale.

            Xiuli Wang, Araceli Naranjo, Christine E. Brown … (2016)
            A key determinant of the therapeutic potency of adoptive T-cell transfer is the extent to which infused cells can persist and expand in vivo. Ex vivo propagated virus-specific and chimeric antigen receptor (CAR)-redirected antitumor CD8 effector T cells derived from CD45RA(-) CD62L(+) central memory (TCM) precursors engraft long-term and reconstitute functional memory after adoptive transfer. Here, we describe a clinical scale, closed system, immunomagnetic selection method to isolate CD8(+) T(CM) from peripheral blood mononuclear cells (PBMC). This method uses the CliniMACS device to first deplete CD14(+), CD45RA(+), and CD4(+) cells from PBMC, and then to positively select CD62L(+) cells. The average purity and yield of CD8(+) CD45RA(-) CD62L TCM obtained in full-scale qualification runs were 70% and 0.4% (of input PBMC), respectively. These CD8(+) T(CM) are responsive to anti-CD3/CD28 bead stimulation, and can be efficiently transduced with CAR encoding lentiviral vectors, and undergo sustained expansion in interleukin (IL)-2/IL-15 over 3-6 weeks. The resulting CD8(+) T(CM)-derived effectors are polyclonal, retain expression of CD62L and CD28, exhibit CAR-redirected antitumor effector function, and are capable of huIL-15-dependent in vivo homeostatic engraftment after transfer to immunodeficient NOD/Scid IL-2RgCnull mice. Adoptive therapy using purified T(CM) cells is now the subject of a Food and Drug Administration-authorized clinical trial for the treatment of CD19(+) B-cell malignancies, and 3 clinical cell products expressing a CD19-specific CAR for IND #14645 have already been successfully generated from lymphoma patients using this manufacturing platform.
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              Smart CARs engineered for cancer immunotherapy.

              Saul Priceman, Stephen Forman, Christine E. Brown (2015)
              Chimeric antigen receptors (CARs) are synthetic immunoreceptors, which can redirect T cells to selectively kill tumor cells, and as 'living drugs' have the potential to generate long-term antitumor immunity. Given their recent clinical successes for the treatment of refractory B-cell malignancies, there is a strong push toward advancing this immunotherapy to other hematological diseases and solid cancers. Here, we summarize the current state of the field, highlighting key variables for the optimal application of CAR T cells for cancer immunotherapy.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): N. Engl. J. Med.
                Title: The New England journal of medicine
                Publisher: New England Journal of Medicine (NEJM/MMS)
                ISSN (Electronic): 1533-4406
                ISSN (Print): 0028-4793
                Publication date (Electronic): December 29 2016
                Volume: 375
                Issue: 26
                Affiliations
                [1 ] From the Department of Hematology and Hematopoietic Cell Transplantation, T Cell Therapeutics Research Laboratory (C.E.B., D.A., R.S., L.W., J.R.W., A.N., J.R.O., A.K., S.J.P., X.W., S.J.F.), and the Departments of Information Sciences (M.S.B.), Clinical Research (J.K., J.S.), Neurosurgery (T.L.H., M.C., B.B.), Pathology (M.D.), Diagnostic Radiology (J.A.R.), Developmental and Stem Cell Biology (M.E.B.), and Medical Oncology and Therapeutics Research (J.P.), City of Hope Beckman Research Institute and Medical Center, Duarte, CA; and the Ben Towne Center for Childhood Cancer Research, Seattle Children's Research Institute, Seattle (M.C.J.).
                Article
                DOI: 10.1056/NEJMoa1610497
                PubMed ID: 28029927
                SO-VID: a597eb59-a2a4-422b-bd7b-3923fbfd2d54
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