TRPM2 cation channels are widely expressed in the immune system and are thought to play a role in immune cell responses to oxidative stress. Patch clamp analyses suggest that TRPM2 channel activation can occur through a direct action of oxidants on TRPM2 channels or indirectly through the actions of a related group of adenine nucleotide 2nd messengers. However, the contribution of each gating mechanism to oxidative stressinduced TRPM2 activation in lymphocytes remains undefined. To better understand the molecular events leading to TRPM2 activation in lymphocytes, we analyzed oxidative stress-induced turnover of intracellular NAD, the metabolic precursor of adenine nucleotide 2nd messengers implicated in TRPM2 gating, and oxidative stress-induced TRPM2-mediated currents and Ca 2؉ transients in DT40 B cells. TRPM2-dependent Ca 2؉ entry did not influence the extent or time course of oxidative stressinduced turnover of NAD. Furthermore, expression of oxidative stress-activated poly(ADP-ribose) polymerases (PARPs) was required for oxidative stress-induced NAD turnover, TRPM2 currents, and TRPM2-dependent Ca 2؉ transients; no oxidantinduced activation of TRPM2 channels could be detected in PARP-deficient cells. Together, our results suggest that during conditions of oxidative stress in lymphocytes, TRPM2 acts as a downstream effector of the PARP/poly(ADP-ribose) glycohydrolase pathway through PARP-dependent formation of ADP-ribose.
T-cell-recruiting bispecific antibodies (T-BsAbs) have shown potent tumor killing activity in humans, but cytokine release-related toxicities have affected their clinical utility. The use of novel anti-CD3 binding domains with more favorable properties could aid in the creation of T-BsAbs with improved therapeutic windows. Using a sequence-based discovery platform, we identified new anti-CD3 antibodies from humanized rats that bind to multiple epitopes and elicit varying levels of T-cell activation. In T-BsAb format, 12 different anti-CD3 arms induce equivalent levels of tumor cell lysis by primary T-cells, but potency varies by a thousand-fold. Our lead CD3-targeting arm stimulates very low levels of cytokine release, but drives robust tumor antigen-specific killing in vitro and in a mouse xenograft model. This new CD3-targeting antibody underpins a next-generation T-BsAb platform in which potent cytotoxicity is uncoupled from high levels of cytokine release, which may lead to a wider therapeutic window in the clinic.
Background: BCMA targeted immunotherapy has yielded promising results for relapsed/refractory multiple myeloma (RRMM). TNB-383B is a BCMA x CD3 bispecific T-cell redirecting antibody incorporating a unique anti-CD3 moiety that preferentially activates effector over regulatory T-cells and uncouples cytokine release from anti-tumor activity, as well as 2 heavy-chain-only anti-BCMA moieties for a 2:1 tumor associated antigen to CD3 stoichiometry. Results from the ongoing phase 1 dose escalation and expansion First-in-Human (FIH) study of TNB-383B are presented (NCT03933735). Methods: Eligible patients have RRMM and have been exposed to at least 3 prior lines of therapy including a proteasome inhibitor, an immunomodulatory drug, and an anti-CD38 monoclonal antibody. Patients have been treated with escalating doses of TNB-383B infused IV over 1-2 hours Q3W (without step-up dosing). The primary objectives are to determine the safety/tolerability and clinical pharmacology of TNB-383B and to identify the MTD/RP2D. The study used a 3+3 design for dose escalation, with additional patients enrolled on cleared dose levels. Patients on earlier dose cohorts were allowed to increase to the highest cleared dose with investigator consensus. Responses were assessed by IMWG criteria and Adverse Events (AEs) were graded according to CTCAE v5.0. Minimal residual disease (MRD) assessment was performed via NGS on bone marrow samples in patients achieving a complete response (CR). Results: As of 13 July 2020, 38 subjects have been dosed with TNB-383B (0.025 - 40 mg). Demographics and disease characteristics at study entry are summarized in Table 1. The most common Gr 3/4 AEs were anemia (6/38; 16%) and thrombocytopenia (5/38; 13%). The most common drug-related AEs were CRS (8/38; 21%) and headache (5/38; 13%). One case of Gr 2 CRS was observed at 0.075 mg; all other CRS events were seen at 5.4 mg and above. Cases of CRS were grade 1 (5/8) or 2 (3/8) and occurred only after the first dose of TNB-383B. All but 3 subjects were managed with fluids and acetaminophen (the other 3 received 1 dose each of tocilizumab). One DLT, Gr3 confusion that resolved within 6 hours without sequelae was seen at the 20 mg dose in an additional patient enrolled on this cohort. No IRRs were observed. Dose modification was necessary in 1 subject for Gr 3 neutropenia associated with CRS; the subject escalated to their full dose after tolerating subsequent doses without incident. 5 subjects died from their underlying disease during follow-up. 15 subjects discontinued treatment, all of them for progressive disease. Preliminary PK data support Q3W dosing of TNB-383B. Activity was observed in one patient each at 0.2 mg and 1.8 mg; at doses of 5.4 - 40 mg an ORR of 52% (12/23) was observed. Depth and duration of response are summarized in Table 2. Conclusions: TNB-383B is well tolerated at doses up to 40 mg, without the need for step/split dosing. A preliminary ORR of 52% (12/23) was observed at doses ≥ 5.4 mg, including deep (6 PR / 3 VGPR / 3 CR) and durable (up to 24 weeks) responses despite dosing only every 3 weeks. Enrollment into the dose escalation arm is ongoing; updated data will be presented at the meeting. Disclosures Rodriguez: BMS, Takeda, Amgen: Consultancy, Speakers Bureau. D'Souza:Amgen: Research Funding; Akcea: Consultancy; Pfizer: Consultancy; Teneobio: Research Funding; Imbrium: Consultancy; Merck: Research Funding; Janssen: Consultancy. Shah:GSK, Amgen, Indapta Therapeutics, Sanofi, BMS, CareDx, Kite, Karyopharm: Consultancy; BMS, Janssen, Bluebird Bio, Sutro Biopharma, Teneobio, Poseida, Nektar: Research Funding. Voorhees:Bristol-Myers Squibb: Other: Personal fees; Adaptive Biotechnologies: Other: Personal fees; Novartis: Other: Personal fees; Celgene: Other: Personal fees; Janssen: Other: Personal fees; Oncopeptides: Other: Personal fees; TeneoBio: Other: Personal fees; Levine Cancer Institute, Atrium Health: Current Employment. Buelow:Teneobio, Inc.: Current Employment, Current equity holder in private company. Kumar:Karyopharm: Consultancy; Tenebio: Other, Research Funding; Sanofi: Research Funding; Oncopeptides: Consultancy, Other: Independent Review Committee; IRC member; AbbVie: Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments; Genecentrix: Consultancy; Dr. Reddy's Laboratories: Honoraria; Adaptive Biotechnologies: Consultancy; Merck: Consultancy, Research Funding; Takeda: Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments; BMS: Consultancy, Research Funding; Cellectar: Other; Janssen Oncology: Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments; Carsgen: Other, Research Funding; Amgen: Consultancy, Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments, Research Funding; Celgene/BMS: Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments; Novartis: Research Funding; MedImmune: Research Funding; Genentech/Roche: Other: Research funding for clinical trials to the institution, Consulting/Advisory Board participation with no personal payments; Kite Pharma: Consultancy, Research Funding.
PURPOSE ABBV-383, a B-cell maturation antigen × CD3 T-cell engaging bispecific antibody, has demonstrated promising results in an ongoing first-in-human phase I study (ClinicalTrials.gov identifier: NCT03933735 ) in patients with relapsed/refractory multiple myeloma (RRMM). Herein, we report safety and efficacy outcomes of this phase I dose escalation/expansion study. METHODS Patients with RRMM (≥ three prior lines including a proteasome inhibitor, an immunomodulatory drug, and an anti-CD38 monoclonal antibody) were eligible. ABBV-383 was administered intravenously over 1-2 hours once every 3 weeks, without any step dosing. A 3 + 3 design with backfilling for dose escalation was used (intrapatient escalation to highest safe dose permitted) followed by initiation of dose expansion. RESULTS As of January 8, 2022, 124 patients (dose escalation [0.025-120 mg], n = 73; dose expansion [60 mg], n = 51) have received ABBV-383; median age was 68 years (range, 35-92 years). The most common hematologic treatment-emergent adverse events (TEAEs) were neutropenia (all grades: 37%) and anemia (29%). The most common nonhematologic TEAEs were cytokine release syndrome (57%) and fatigue (30%). Seven deaths from TEAEs were reported with all considered unrelated to study drug by the investigator. For all efficacy-evaluable patients (n = 122; all doses), the objective response rate (ORR) was 57% and very good partial response (VGPR) or better (≥ VGPR) rate was 43%. In the 60 mg dose expansion cohort (n = 49), the ORR and ≥ VGPR rates were 59% and 39%, respectively; and in the ≥ 40 mg dose escalation plus dose expansion cohorts (n = 79) were 68% and 54%, respectively. CONCLUSION ABBV-383 in patients with RRMM was well tolerated with an ORR of 68% at doses ≥ 40 mg. This novel therapy's promising preliminary antitumor activity in heavily pretreated patients warrants further clinical evaluation.
During affinity maturation, genomic integrity is maintained through specific targeting of DNA mutations. The DNA damage sensor PARP-1 helps determine whether a DNA lesion results in faithful or mutagenic repair.
Background Prognosis is poor for patients (pts) with relapsed/refractory multiple myeloma (RRMM; median overall survival: <1 year), indicating a clear need to identify agents with novel mechanisms of action. B-cell maturation antigen (BCMA) has recently emerged as a novel treatment target for MM due to its highly selective expression in plasma cells. TNB-383B, a BCMA x CD3 T-cell engaging bispecific antibody, was designed to overcome the toxicity limitations of existing BCMA therapies and has demonstrated promising results in an ongoing first-in-human phase 1 study in pts with RRMM (Rodriguez C, et al. Blood 2020;136[suppl 1]:43-44). Herein, we report the updated efficacy and safety outcomes of this phase 1 study. Methods This multicenter, phase 1, open-label, dose-escalation/expansion study (NCT03933735) enrolled pts with RRMM (≥3 prior lines of therapy that included a proteasome inhibitor, an immunomodulatory drug, and an anti-CD38 monoclonal antibody), estimated glomerular filtration rate ≥30 mL/min as calculated by the Modification of Diet in Renal Disease formula, and ECOG performance status ≤2. Prior BCMA-targeted therapy is prohibited. Primary objectives include safety/tolerability, pharmacokinetics (PK), and determination of recommended phase 2 dose (RP2D); secondary objectives include assessment of clinical activity (per IMWG criteria 2016). TNB-383B is administered intravenously over 1-2 hours every 3 weeks (Q3W) with the first dose administered inpatient. The study uses a 3+3 design with backfilling for dose and permits intrapatient dose escalation to highest safe dose. Dose expansion was initiated on selection of RP2D. Pts are treated until progression, unacceptable toxicity, or other discontinuation criteria are met. The efficacy-evaluable population includes all pts who received at least 1 dose of TNB-383B and have at least 1 postdose assessment. The safety population includes all pts who received at least 1 dose of study drug; adverse events (AEs) are graded according to NCI CTCAE v5.0. Results As of 10 May 2021, 103 pts (dose escalation, n=73; dose expansion, n=30) have been treated with TNB-383B (0.025-120 mg). The RP2D of 60 mg Q3W was selected on the basis of tolerability, safety, PK, and clinical activity. Pt demographics and baseline characteristics are summarized in Table 1. Three dose-limiting toxicities were reported in dose escalation (platelet count decreased: grade [Gr] 4, 60 mg; cytokine release syndrome [CRS]: Gr 3, 90 mg and 120 mg); none were reported as serious. Treatment-related AEs (TRAEs) were reported in 79 (77%) pts, with Gr ≥3 and serious AEs occurring in 33 (32%) and 23 (22%) pts, respectively. The most common TRAEs (Table 2) include CRS (n=54, 52%), neutropenia (n=18, 17%), and fatigue (n=14, 14%). At the RP2D (n=39), the Gr ≥3 CRS rate was 3% (n=1). Onset of CRS typically occurred on the same or next day following the first dose and all pts recovered using tocilizumab or standard supportive care measures. Treatment-emergent AEs (TEAEs) of infusion-related reactions were reported in 8 (8%) pts and infections occurred in 29 (28%) pts; pneumonia (n=5, 5%) and upper respiratory tract infection (n=4, 4%) were the most common. Five deaths from TEAEs were reported; all were unrelated to study drug. Forty-two (40%) pts discontinued treatment due to disease progression. In the dose-escalation cohorts of ≥40 mg Q3W (n=24), the objective response rate (ORR) was 79% (19/24), with a very good partial response or better (≥VGPR) rate of 63% (15/24), and a complete response (CR) rate of 29% (7/24) at the data cutoff date; these pts have the longest follow-up (ie, mature data) with median time on study of 6.1 months (Figure 1). At doses ≥40 mg in the combined dose-escalation and -expansion cohorts (n=44), the observed ORR, ≥VGPR, and CR rates were 64% (28/44), 43% (19/44), and 16% (7/44), respectively; these pts have shorter follow-up (ie, immature data) with median time on study of 3.1 months. Twenty-nine (66%) of the 44 pts administered ≥40 mg were triple-class refractory and reported an ORR of 55% (16/29). Conclusions TNB-383B in pts with RRMM is well tolerated with an ORR of 79% observed at doses ≥40 mg in the dose-escalation cohorts. Despite having a shorter follow-up period, this trend was also observed at doses ≥40 mg in the combined dose-escalation/expansion cohorts (ORR: 64%). Enrollment into the dose-expansion arm is ongoing; updated data will be presented at the meeting. Figure 1 Figure 1. Disclosures Kumar: Novartis: Research Funding; Carsgen: Research Funding; KITE: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Takeda: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Astra-Zeneca: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Merck: Research Funding; Roche-Genentech: Consultancy, Research Funding; Bluebird Bio: Consultancy; Janssen: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Celgene: Membership on an entity's Board of Directors or advisory committees, Research Funding; Amgen: Consultancy, Research Funding; Beigene: Consultancy; Oncopeptides: Consultancy; Antengene: Consultancy, Honoraria; Tenebio: Research Funding; BMS: Consultancy, Research Funding; Abbvie: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Adaptive: Membership on an entity's Board of Directors or advisory committees, Research Funding; Sanofi: Research Funding. D'Souza: Imbrium, Pfizer, BMS: Membership on an entity's Board of Directors or advisory committees; Sanofi, Takeda, Teneobio, CAELUM, Prothena: Research Funding; Janssen, Prothena: Consultancy. Shah: Oncopeptides: Consultancy; Nektar: Research Funding; Poseida: Research Funding; Janssen: Research Funding; Indapta Therapeutics: Consultancy; GSK: Consultancy; CareDx: Consultancy; BMS/Celgene: Research Funding; Bluebird Bio: Research Funding; CSL Behring: Consultancy; Teneobio: Research Funding; Kite: Consultancy; Sutro Biopharma: Research Funding; Karyopharm: Consultancy; Amgen: Consultancy; Precision Biosciences: Research Funding; Sanofi: Consultancy. Rodriguez: Takeda: Consultancy, Speakers Bureau; Karyopharm: Consultancy, Speakers Bureau; Janssen: Consultancy, Speakers Bureau; BMS: Consultancy, Speakers Bureau; Oncopeptides: Consultancy, Honoraria; Amgen: Consultancy, Speakers Bureau. Voorhees: AbbVie Inc, Bristol-Myers Squibb Company; Consulting Agreement: GlaxoSmithKline, Novartis, Oncopeptides: Other: Advisory Committee; Bristol-Myers Squibb Company.: Other: Data Safety & Monitoring. Bueno: AbbVie: Current Employment, Current equity holder in publicly-traded company. Buelow: Teneobio, Inc.: Current Employment, Current holder of stock options in a privately-held company. Freise: Abbvie, Inc.: Current Employment, Current equity holder in publicly-traded company, Current holder of individual stocks in a privately-held company. Yue: Abbvie, Inc.: Current Employment, Current equity holder in publicly-traded company, Current holder of individual stocks in a privately-held company. Pothacamury: AbbVie: Current Employment, Current equity holder in publicly-traded company, Current holder of individual stocks in a privately-held company. Polepally: Abbvie, Inc.: Current Employment, Current equity holder in publicly-traded company, Current holder of individual stocks in a privately-held company. Vij: BMS: Research Funding; Takeda: Honoraria, Research Funding; Sanofi: Honoraria, Research Funding; BMS: Honoraria; GSK: Honoraria; Oncopeptides: Honoraria; Karyopharm: Honoraria; CareDx: Honoraria; Legend: Honoraria; Biegene: Honoraria; Adaptive: Honoraria; Harpoon: Honoraria.
BackgroundTherapeutic options currently available for metastatic castration-resistant prostate cancer (mCRPC) do not extend median overall survival >6 months. Therefore, the development of novel and effective therapies for mCRPC represents an urgent medical need. T cell engagers (TCEs) have emerged as a promising approach for the treatment of mCRPC due to their targeted mechanism of action. However, challenges remain in the clinic due to the limited efficacy of TCEs observed thus far in solid tumors as well as the toxicities associated with cytokine release syndrome (CRS) due to the usage of high-affinity anti-CD3 moieties such as OKT3.MethodsUsing genetically engineered transgenic rats (UniRat and OmniFlic) that express fully human IgG antibodies together with an NGS-based antibody discovery pipeline, we developed TNB-585, an anti-CD3xPSMA TCE for the treatment of mCRPC. TNB-585 pairs a tumor-targeting anti-PSMA arm together with a unique, low-affinity anti-CD3 arm in bispecific format. We tested TNB-585 in T cell-redirected cytotoxicity assays against PSMA+ tumor cells in both two-dimensional (2D) cultures and three-dimensional (3D) spheroids as well as against patient-derived prostate tumor cells. Cytokines were measured in culture supernatants to assess the ability of TNB-585 to induce tumor killing with low cytokine release. TNB-585-mediated T cell activation, proliferation, and cytotoxic granule formation were measured to investigate the mechanism of action. Additionally, TNB-585 efficacy was evaluated in vivo against C4-2 tumor-bearing NCG mice.ResultsIn vitro, TNB-585 induced activation and proliferation of human T cells resulting in the killing of PSMA+ prostate tumor cells in both 2D cultures and 3D spheroids with minimal cytokine release and reduced regulatory T cell activation compared with a positive control antibody that contains the same anti-PSMA arm but a higher affinity anti-CD3 arm (comparable with OKT3). In addition, TNB-585 demonstrated potent efficacy against patient-derived prostate tumors ex vivo and induced immune cell infiltration and dose-dependent tumor regression in vivo.ConclusionsOur data suggest that TNB-585, with its low-affinity anti-CD3, may be efficacious while inducing a lower incidence and severity of CRS in patients with prostate cancer compared with TCEs that incorporate high-affinity anti-CD3 domains.
Chimeric antigen receptor (CAR) T cells expressing B-cell maturation antigen (BCMA) can target and kill multiple myeloma (MM). BCMA was chosen as a target for MM because it is expressed by almost all cases of MM but has a restricted expression pattern on normal cells. CAR antigen-recognition domains made up of monoclonal antibody-derived, single-chain-variable fragments (scFv) are potentially immunogenic. To reduce the risk of recipient immune responses against CAR T cells, we used the sequence of a novel anti-BCMA, fully-human, heavy-chain-only binding domain designated FHVH33. The FHVH33 binding domain sequence was from TeneoBio, Inc. FHVH33 is smaller than a scFv. FHVH33 lacks the light chain, artificial linker sequence, and 2 associated junctions of a scFv, so it is predicted to be less immunogenic than a scFv, especially murine-derived scFvs. We constructed a CAR incorporating FHVH33, CD8α hinge and transmembrane domains, a 4-1BB costimulatory domain, and a CD3ζ T-cell activation domain. The CAR, FHVH33-CD8BBZ, is encoded by a γ-retroviral vector. FHVH33-CD8BBZ-expressing T cells (FHVH-BCMA-T) exhibited a full range of T-cell functions in vitro and eliminated tumors and disseminated malignancy in mice (Lam et al, Blood (ASH abstract) 2017 vol 130: 504). We are conducting the first clinical trial of FHVH-BCMA-T. Patients receive conditioning chemotherapy on days -5 to -3 with 300 mg/m2 of cyclophosphamide and 30 mg/m2 of fludarabine followed by infusion of FHVH-BCMA-T on day 0. This dose-escalation trial has 5 planned dose levels (DL). Twelve patients have received FHVH-BCMA-T on 3 DLs, 0.75x106, 1.5x106 and 3x106 CAR+ T cells/kg of bodyweight. Three patients were enrolled on the trial but not treated. The median age of patients enrolled was 63 (range 52-70); patients received a median of 6 lines of anti-myeloma therapy (range 3-10) prior to treatment with FHVH-BCMA-T. Ten patients out of 12 patients have achieved objective responses (OR). Five patients have obtained CRs or VGPRs to date. One patient achieved a partial remission (PR) 26 weeks after FHVH-BCMA-T infusion through a continued decrease in a measurable plasmacytoma. Five out of 7 patients who had myeloma with high-risk cytogenetics had an OR (Table). ORs occurred in patients with large soft-tissue plasmacytomas. Loss of BCMA expression on myeloma cells after treatment was documented in 2 patients. Two patients who developed progressive MM after CAR T-cell infusion had evidence of minimal residual disease in bone marrow 1-2 months post infusion of CAR T cells (patients 7,8). Eleven out of 12 patients had cytokine release syndrome (CRS); CRS grades ranged from 1-3 (Lee et al. Biol Blood Marrow Transplant 25 (2019) 625-638). The median peak C reactive protein (CRP) of the patients with CRS was 156.3 mg/L. Of 12 patients, 1 received the interleukin-6-receptor antagonist tocilizumab on day +6 to treat grade 3 CRS with hypotension requiring low-dose pressor therapy, grade 2 ejection fraction (EF) decrease and elevation of creatinine kinase (CK). All parameters returned to baseline by day +10. Patient 12 had a grade 3 decrease in EF which resolved by day +29. Two patients had grade 2 neurotoxicity that resolved without intervention: patient 3 had headaches, dysarthria and word-finding difficulties that resolved after 6 days while patient 6 had headaches on day +4. Patient 12 had grade 3 neurotoxicity with confusion on day +2; she was given dexamethasone with improvement in mental status the same day. After attaining a response, patient 6 died from influenza complications 6 weeks after FHVH-BCMA-T infusion. A median of 10.6% (range 1.1-46) of bone marrow T cells were CAR+ when assessed 14 days after FHVH-BCMA-T infusion. We assessed blood CAR+ cells by quantitative PCR. The median peak level of CAR+ cells was 76.5 cells/µl (range 3-347 cells/µl) and the median day post-infusion of peak blood CAR+ cell levels was 13 (range 9-14). The results from this phase 1 trial demonstrate that FHVH-BCMA-T cells can induce responses at low dose levels. Patients who had no CRS or low-grade CRS achieved objective responses. Toxicity was limited and reversible. Accrual to this trial continues. A maximum tolerated dose has not been determined yet. These results encourage further development of FHVH CAR-T. Table Disclosures Manasanch: Janssen: Honoraria; Sanofi: Honoraria; Takeda: Honoraria; Merck: Research Funding; Skyline Diagnostics: Research Funding; Sanofi: Research Funding; Quest Diagnostics: Research Funding; Celgene: Honoraria. Trinklein:Teneobio, Inc.: Employment, Equity Ownership. Buelow:Teneobio, Inc.: Employment, Equity Ownership. Kochenderfer:Kite and Celgene: Research Funding; Bluebird and CRISPR Therapeutics: Other: received royalties on licensing of his inventions. OffLabel Disclosure: Cyclophosphamide and fludarabine are used in combination for conditioning chemotherapy prior to CAR T-cell infusion
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