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NKG2D ligands are widely expressed in solid and hematologic malignancies but absent or poorly expressed on healthy tissues. We conducted a phase I dose-escalation study to evaluate the safety and feasibility of a single infusion of NKG2D-chimeric antigen receptor (CAR) T cells, without lymphodepleting conditioning in subjects with acute myeloid leukemia/myelodysplastic syndrome or relapsed/refractory multiple myeloma. Autologous T cells were transfected with a γ-retroviral vector encoding a CAR fusing human NKG2D with the CD3ζ signaling domain. Four dose levels (1 × 106–3 × 107 total viable T cells) were evaluated. Twelve subjects were infused [7 acute myeloid leukemia (AML) and 5 multiple myeloma]. NKG2D-CAR products demonstrated a median 75% vector-driven NKG2D expression on CD3+ T cells. No dose-limiting toxicities, cytokine release syndrome, or CAR T cell–related neurotoxicity was observed. No significant autoimmune reactions were noted, and none of the ≥ grade 3 adverse events were attributable to NKG2D-CAR T cells. At the single injection of low cell doses used in this trial, no objective tumor responses were observed. However, hematologic parameters transiently improved in one subject with AML at the highest dose, and cases of disease stability without further therapy or on subsequent treatments were noted. At 24 hours, the cytokine RANTES increased a median of 1.9-fold among all subjects and 5.8-fold among six AML patients. Consistent with preclinical studies, NKG2D-CAR T cell–expansion and persistence were limited. Manufactured NKG2D-CAR T cells exhibited functional activity against autologous tumor cells in vitro, but modifications to enhance CAR T-cell expansion and target density may be needed to boost clinical activity.

NKG2D-CAR T Cell Product Transduction Assessment

Antibody details

Inflammatory responses associated with ischemia/reperfusion injury (IRI) play a central role in alloimmunity and transplant outcomes. A key event driving these inflammatory responses is the burst of reactive oxygen species, with hydrogen peroxide (H(2)O(2)) as the most abundant form that occurs as a result of surgical implantation of the donor organ. Here, we used a syngeneic rat renal transplant and IRI model to evaluate the therapeutic properties of APP-103, a copolyoxalate molecule containing vanillyl alcohol (VA) that exhibits high sensitivity and specificity towards the production of H(2)O(2). We show that APP-103 is safe, effectively promotes kidney function following IRI, and survival of renal transplants. APP-103 reduces tissue injury and IRI-associated inflammatory responses in models of both warm ischemia (kidney clamping) and prolonged cold ischemia (syngeneic renal transplant). Mechanistically, we demonstrate that APP-103 exerts protective effects by specifically targeting the production of reactive oxygen species (ROS). Our data introduce APP-103 as a novel, non-toxic and site-activating therapeutic approach that effectively ameliorates the consequences of IRI in solid organ transplantation.

NKG2D ligands are widely expressed in solid and hematologic malignancies but absent or poorly expressed on healthy tissues. We conducted a phase I dose-escalation study to evaluate the safety and feasibility of a single infusion of NKG2D-chimeric antigen receptor (CAR) T cells, without lymphodepleting conditioning in subjects with acute myeloid leukemia/myelodysplastic syndrome or relapsed/refractory multiple myeloma. Autologous T cells were transfected with a γ-retroviral vector encoding a CAR fusing human NKG2D with the CD3ζ signaling domain. Four dose levels (1 × 106–3 × 107 total viable T cells) were evaluated. Twelve subjects were infused [7 acute myeloid leukemia (AML) and 5 multiple myeloma]. NKG2D-CAR products demonstrated a median 75% vector-driven NKG2D expression on CD3+ T cells. No dose-limiting toxicities, cytokine release syndrome, or CAR T cell–related neurotoxicity was observed. No significant autoimmune reactions were noted, and none of the ≥ grade 3 adverse events were attributable to NKG2D-CAR T cells. At the single injection of low cell doses used in this trial, no objective tumor responses were observed. However, hematologic parameters transiently improved in one subject with AML at the highest dose, and cases of disease stability without further therapy or on subsequent treatments were noted. At 24 hours, the cytokine RANTES increased a median of 1.9-fold among all subjects and 5.8-fold among six AML patients. Consistent with preclinical studies, NKG2D-CAR T cell–expansion and persistence were limited. Manufactured NKG2D-CAR T cells exhibited functional activity against autologous tumor cells in vitro, but modifications to enhance CAR T-cell expansion and target density may be needed to boost clinical activity.

Introduction: Conventional CAR-T cells express a single chain antibody variable fragment that restricts recognition to one tumor antigen and a limited set of cancers. This study employs a novel CAR fusing full-length human NKG2D with the CD3z signaling domain. In autologous transduced CM-CS1 T cells, NKG2D CAR receives endogenous costimulation via DAP10 to target multiple NKG2D-ligands that are upregulated in solid and hematologic malignancies but absent or poorly expressed on healthy tissues. Methods: A phase 1 dose-escalation study to establish safety and feasibility of a single infusion of CM-CS1 T cells without lymphodepleting conditioning enrolled subjects with AML/MDS-RAEB or relapsed/refractory progressive multiple myeloma (MM) without standard therapy options (NCT02203825). Eligibility criteria included suitable organ function, no CNS disease, no prior allogeneic SCT or adoptive T-cell therapy, no therapy within 3 weeks prior to infusion, no immune suppression, and no uncontrolled infection. Dose-escalation spanned 4 cohorts [half-log increments from 1x106 to 3x107 CM-CS1 T cells] according to a 3+3 design. DLTs included ≥ Grade 3 non-hematologic toxicity or ≥ Grade 2 autoimmune toxicity related to CAR T cells. Initial assessment was at 28 days. At least 1 AML/MDS and 1 MM subject were mandated in each dose level. Manufacturing included PBMC stimulation with OKT3 and IL-2 followed by 2 rounds of retroviral transduction at DFCI's Cell Manipulation Core Facility. Vector copy number (VCN) and replication-competent retrovirus (RCR) testing were performed on whole blood and PBMCs, respectively, using quantitative PCR. Results: From April 2015 to July 2016, 11 subjects were infused, and 10 completed the DLT period. Eight of 11 were male, 6 had AML/MDS, and median age was 70 (range 44 to 79) (Panel A). Median WBC was 2.3 (range 0.7 to 7.2 K/uL); median ALC was 0.74 (range 0.09-2.37 K/uL). Five had cells manufactured from peripheral blood; 6 underwent apheresis. Median percentage of blasts in bone marrow for AML/MDS patients was 50% (range 4-68%). All myeloma patients had undergone ≥ 5 therapies including ≥1 autologous SCT. Four of the 6 AML/MDS patients had secondary disease, 3 had complex cytogenetics, 3 had p53 mutations, and 1 had a FLT3-ITD mutation. Dose-escalation proceeded from 1x106 to 3x107 CM-CS1 T cells. All 11 products passed release criteria, and there were no infusion reactions. Products consisted of median 97.2% CD3+ cells and 31.0% CD8+ cells, with vector-specific NKG2D expression on median 74.6% of CD3+ and 66.3% of CD8+ cells (Panel B). The first 10 subjects completed their 28 day evaluation period without DLTs. There were no cases of cytokine release syndrome, cell-related neurotoxicity, auto-immunity, or CAR T-related death. SAEs included a Grade 4 intracochlear bleed and an episode each of grade 4 neutropenia and thrombocytopenia deemed related to disease progression. Forty percent of patients experienced some Grade 3 toxicity, all related to underlying disease or a complication thereof (Panel C). At these initial cell doses, no patient to date has had objective tumor response at the 28 day evaluation mark. Nine initiated subsequent therapies; there have been 4 deaths secondary to disease or complications of subsequent therapies. However, cases of unexpected survival without further therapy and responses to subsequent treatments were noted. For example a patient with p53-mutated AML survived 4 months despite 50% blasts at infusion, and another entered PR at 6+months after cells on an IDH-1 inhibitor with Conclusion: In the first 3+ dose-escalation cohorts of patients with AML/MDS and myeloma, a single dose of CM-CS1 T cells without lymphodepletion was feasible and well-tolerated, with no DLTs. CAR T cells generally have not persisted beyond 1 week, consistent with pre-clinical models. Correlative analyses including post-infusion immunophenotyping are in process. Future studies of multiple infusions of NKG2D CAR T cells in both hematologic malignancies and solid tumors at the higher cell doses associated with efficacy in pre-clinical models are in planning. Table Table. Disclosures Murad: Celdara Medical, LLC: Employment. Reder:Celdara Medical, LLC: Employment. Sentman:Celdara Medical, LLC: Membership on an entity's Board of Directors or advisory committees, Other: Holds patents on this technology. Wade:Celdara Medical, LLC: Employment. Schmucker:Celdara Medical, LLC: Employment. Lehmann:Celyad, SA: Employment. Snykers:Celyad, SA: Employment. Allen:Celyad, SA: Employment. Stone:Celator: Consultancy; Jansen: Consultancy; Novartis: Consultancy; Merck: Consultancy; ONO: Consultancy; Sunesis Pharmaceuticals: Consultancy; Roche: Consultancy; Celgene: Consultancy, Membership on an entity's Board of Directors or advisory committees; Juno Therapeutics: Consultancy; Xenetic Biosciences: Consultancy; Agios: Consultancy; Abbvie: Consultancy, Membership on an entity's Board of Directors or advisory committees; Seattle Genetics: Consultancy; Pfizer: Consultancy; Karyopharm: Consultancy; Amgen: Consultancy. Soiffer:Kiadis: Membership on an entity's Board of Directors or advisory committees; Juno: Consultancy. Dranoff:Novartis: Employment. Ritz:Kiadis: Membership on an entity's Board of Directors or advisory committees.

TPS3102Background: Canonical CAR-T cell constructs encode a single chain antibody variable fragment, costimulatory domain, and signaling domain of CD3 zeta. This restricts recognition to 1 tumor an...