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GSK plc (LSE/NYSE: GSK) today announced that DREAMM-3, the phase III open-label, randomised head-to-head superiority trial of Blenrep (belantamab mafodotin) monotherapy versus pomalidomide in combination with low dose dexamethasone (PomDex) in patients with relapsed or refractory multiple myeloma (RRMM), did not meet its primary endpoint of progression-free survival (PFS).
\nIn the DREAMM-3 trial, the primary endpoint of PFS demonstrated a hazard ratio (HR) of 1.03 (95% CI: 0.72 1.47). The observed median progression-free survival was longer for belantamab mafodotin vs PomDex (11.2 months vs 7 months). Secondary endpoints include overall response rate (ORR), duration of response (DOR) and overall survival (OS). The ORR was 41% for belantamab mafodotin and 36% for PomDex. Belantamab mafodotin demonstrated a deeper response rate when compared with PomDex (25% VGPR or better with belantamab mafodotin compared to 8% with PomDex). The median follow-up was 11.5 months for belantamab mafodotin and 10.8 months for PomDex; the median DOR was not reached for belantamab mafodotin (95% CI: 17.9, --) vs 8.5 months (95% CI: 7.6, --) for PomDex; DOR rates at 12 months were 76.8% and 48.4% for belantamab mafodotin and PomDex respectively. The safety and tolerability profile of belantamab mafodotin was consistent with the known safety profile, and no new safety signals were identified. Overall rates of grade 3 keratopathy are consistent with prior reported data.
\nAt the time of the primary analysis, the OS data had only achieved 37.5% overall maturity. The median OS was 21.2 and 21.1 months for belantamab mafodotin and PomDex, respectively, with an HR of 1.14 (95% CI: 0.77, 1.68).
\nBlenrep was granted accelerated approval by the US Food and Drug Administration (FDA) as a monotherapy for treating adult patients with RRMM who have received at least four prior therapies, including an anti-CD38 monoclonal antibody, a proteasome inhibitor, and an immunomodulatory agent. The accelerated approval was based on the results of the DREAMM-2 overall response rate, DOR and contingent upon a confirmed clinical benefit from a randomised phase III clinical trial. Data from DREAMM-3 is in the process of being shared with health authorities. Discussions with health authorities are currently ongoing.
\nAdditional trials within the DREAMM (DRiving Excellence in Approaches to Multiple Myeloma) clinical trial programme will continue. These trials are designed to demonstrate the benefit of Blenrep in combination treatment with novel therapies and standard-of-care treatments in earlier lines of therapy and dosing optimisation to maintain efficacy while reducing corneal events. Data from the DREAMM-7 and DREAMM-8 phase III trials are anticipated in the first half of 2023.
\nAbout DREAMM-3
The DREAMM-3 phase III trial is an open-label, randomised trial evaluating the efficacy and safety of single-agent belantamab mafodotin compared to PomDex in patients with RRMM. A total of 325 participants were randomised in a 2:1 ratio to receive either single agent belantamab mafodotin administered as a 2.5 mg/kg dose every three weeks (Q3W), or PomDex. Pomalidomide was administered daily on days 1 to 21 of each 28-day cycle, with dexamethasone administered once weekly (days 1, 8, 15, and 22 of each cycle). The primary endpoint was PFS. Secondary endpoints include safety, OS, overall response rate, DOR and assessment of minimal residual disease.
About DREAMM-7
DREAMM-7 is evaluating the safety and efficacy of belantamab mafodotin in combination with bortezomib and dexamethasone versus daratumumab in combination with bortezomib and dexamethasone.
About DREAMM-8
DREAMM-8 is assessing the efficacy and safety of belantamab mafodotin in combination with pomalidomide and dexamethasone compared with that of a combination of pomalidomide, bortezomib and dexamethasone in participants with relapsed/refractory multiple myeloma.
About multiple myeloma
Multiple myeloma is the second most common blood cancer in the US and is generally considered treatable, but not curable.[1],[2] In the US, more than 32,000 people are estimated to be diagnosed with multiple myeloma this year and nearly 13,000 people will die from the disease.[3] Research into new therapies is needed as multiple myeloma commonly becomes refractory to available treatments.[4]
About B-cell maturation antigen (BCMA)
The normal function of BCMA is to promote plasma cell survival by transduction of signals from two known ligands, BAFF (B-cell activating factor) and APRIL (a proliferation-inducing ligand). This pathway has been shown to be important for myeloma cell growth and survival. BCMA expression is limited to B cells at later stages of development. BCMA is expressed at varying levels in myeloma patients and BCMA membrane expression is universally detected in myeloma cell lines.[5]
About Blenrep
Blenrep is an antibody drug conjugate comprising a humanised BCMA monoclonal antibody conjugated to the cytotoxic agent auristatin F via non-cleavable linker. The drug linker technology is licensed from Seagen Inc.; monoclonal antibody is produced using POTELLIGENT Technology licensed from BioWa Inc. a member of the Kyowa Kirin Group.
GSK in oncology
GSK is focused on maximising patient survival through transformational medicines. GSK’s pipeline is focused on immuno-oncology, tumour cell targeting therapies and synthetic lethality. Our goal is to achieve a sustainable flow of new treatments based on a diversified portfolio of investigational medicines utilising modalities such as small molecules, antibodies, and antibody-drug conjugates, either alone or in combination.
About GSK
GSK is a global biopharma company with a purpose to unite science, technology, and talent to get ahead of disease together. Find out more at gsk.com/company.
Cautionary statement regarding forward-looking statements
GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the Company's Annual Report on Form 20-F for 2021, GSK’s Q3 Results for 2022 and any impacts of the COVID-19 pandemic.
\n
[1] CA: A Cancer Journal for Clinicians, Vol. 70, Issue 1, Han/Feb 2020 Pages 7-30.
\n[2] Kazandjian D. Multiple myeloma epidemiology and survival: A unique malignancy. Semin Oncol. 2016;43(6):676–681. doi:10.1053/j.seminoncol.2016.11.004.
\n[3] SEER Cancer Facts & Figures 2019. Available at: https://seer.cancer.gov/statfacts/html/mulmy.html. Accessed October 2021.
\n[4] Nooka AK, Kastritis E, Dimopoulos MA. Treatment options for relapsed and refractory multiple myeloma. Blood. 2015;125(20).
\n[5] Lonial, S, et al. Belantamab mafodotin for relapsed or refractory multiple myeloma (DREAMM-2): a two-arm, randomised, open-label, phase 2 study. Lancet Oncol. 2020; 21(2):207–21.
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