On November 4, 2019 Unum Therapeutics Inc. (NASDAQ: UMRX), a clinical-stage biopharmaceutical company focused on developing curative cell therapies for cancer, reported a strategic shift to focus development on its ACTR and BOXR product candidates in solid tumors and supportive platform capabilities (Press release, Unum Therapeutics, NOV 4, 2019, View Source [SID1234550246]).
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"We are uniquely positioned to address the challenge of treating solid tumor cancers, and now is the time to focus our efforts, having recently validated our ACTR technology in the hematologic setting and with preclinical data emerging from BOXR1030, the first product candidate from our BOXR platform. Our ACTR technology enables selective T cell targeting for on-tumor attack, while our BOXR platform makes it possible to overcome solid tumor immunosuppression, the fundamental challenge that has limited the effectiveness of cell therapies," said Chuck Wilson Ph.D., President and Chief Executive Officer of Unum. "Our priorities in solid tumors include completing the ongoing Phase 1 trial of ACTR707 in HER2+ cancers; advancing BOXR1030 towards the clinic with an anticipated IND filing in 2020; and expanding our BOXR platform to accelerate discovery of new product candidates across a broad range of immune cell therapies, including both autologous and allogeneic approaches."
ACTR707 was engineered for properties that optimize its function in solid tumors including increased proliferation, cytokine secretion, and persistence. With Unum’s focus on developing therapies for solid tumors, the company will de-prioritize investment in its hematologic programs. Testing through the first four dose levels in the ongoing ATTCK-20-03 Phase 1 trial in non-Hodgkin lymphoma has now established proof-of-concept for ACTR707. Given favorable tolerability to date at relatively low doses, Unum is announcing today plans to continue limited dose escalation to inform potential future development of the program in 2020.
Separately, Unum and its partner, Seattle Genetics, Inc., have suspended further dose-escalation of the ATTCK-17-01 Phase 1 trial of ACTR087 with SEA-BCMA in multiple myeloma pending a further review of this program. No dose-limiting toxicities (DLTs) following ACTR087 administration were reported and no severe adverse events of cytokine release syndrome (CRS) or neurologic events have been observed to date.
Solid Tumor Program Highlights
Phase 1 ATTCK-34-01 Trial: ACTR707 combined with trastuzumab to treat advanced HER2+ solid tumor cancers. Five clinical sites are now activated to support the Phase 1 trial that is currently enrolling patients. Unum expects to report preliminary safety data from patients treated in the first dose cohort of the trial by the end of this year and to report safety and clinical response data from multiple dose cohorts in 2020.
BOXR1030: Incorporating the GOT2 transgene and targeting GPC3+ solid tumor cancers. Unum’s first product candidate selected from its Bolt-On Chimeric Receptor (BOXR) platform, BOXR1030, continues to progress towards first-in-human clinical trials. BOXR1030 expresses a glypican-3 (GPC3) targeted chimeric antigen receptor (CAR) and leverages the "bolt-on" transgene glutamic-oxaloacetic transaminase 2 (GOT2) to improve T cell function in the solid tumor microenvironment by enhancing T cell metabolism. Preclinical studies have characterized the mechanism of action of BOXR1030’s bolt-on transgene with further details to be presented at the upcoming Society for Immunotherapy of Cancer (SITC) (Free SITC Whitepaper) conference during November 6-10, 2019. Based on recent progress, Unum now plans to file an investigational new drug (IND) application for BOXR1030 in late 2020, enabling subsequent clinical testing in GPC3+ cancers.
BOXR Platform Expansion: Unum’s BOXR platform was established over two years ago with the aim of discovering novel transgenes that can be co-expressed with chimeric-targeting receptors to improve the function of T cells in the solid tumor microenvironment. As part of its strategic shift to target solid tumors, Unum will be scaling up its BOXR platform capabilities with the objectives of: (1) expanding the scope of biological mechanisms and transgenes in its proprietary BOXR library, (2) enabling BOXR bolt-on applications for a broad range of immune cell therapies, including both autologous and allogeneic approaches, and (3) advancing new BOXR product candidates into the clinic.
Hematologic Program Highlights
Phase 1 ATTCK-20-03 trial: ACTR707 combined with rituximab for relapsed/refractory non-Hodgkin lymphoma. As a preliminary update provided today for the six patients treated in Cohort 4 (80M ACTR707+ T cells), complete response was achieved at the first response assessment in two of six patients as of the October 2019 analysis, yielding a complete response rate of 40% (eight of 20 patients) in Cohorts 1 through 4. Of the eight complete responders, four remained in complete response at six months of follow-up, two remain in complete response but have not yet reached the six-month timepoint for evaluation, and two progressed before the six-month timepoint. In Cohorts 1 through 4, ACTR707 was well-tolerated in combination with rituximab. No DLTs, no adverse events of CRS, and no severe neurological adverse events including neurotoxicity have been reported as of the October 2019 cutoff. Further results will be presented at the American Society for Hematology (ASH) (Free ASH Whitepaper) Annual Meeting during December 7-10, 2019. Unum plans to enroll up to two additional cohorts (three to four patients per cohort) in the trial, escalating the maximum dose up to 180M ACTR707+ T cells. With patient screening and planned dosing underway, Unum plans to report preliminary results from this dose escalation during 2020. The ability to differentiate on both efficacy and safety relative to currently available therapies and those in development from these additional cohorts will drive a decision during 2020 whether to advance the program into an expanded dose cohort and potential pivotal studies.
Phase 1 ATTCK-17-01 trial: ACTR087 combined with SEA-BCMA for relapsed/refractory multiple myeloma. Two additional cohorts of patients have been treated in the Phase 1 trial in 2019, escalating doses of the SEA-BCMA antibody to 2.0 mg/kg and of the ACTR087+ T cells to 50M. Unum and Seattle Genetics have suspended further dose-escalation of the trial and are reviewing the next steps with this program.
Investor Call and Webcast Information
Unum will host a live conference call and webcast today, November 4, 2019, at 4:30 p.m. ET, to discuss these company updates. To access the call, please dial 866-300-3411 (domestic) or 636-812-6658 (international) and refer to conference ID number 2177408. A webcast will be available at unumrx.com at least 10 minutes before the event begins. The archived webcast will be available at the same location approximately two hours after the event and will be archived for 90 days.