GSK3174998

P1/2, N=9, Terminated, GlaxoSmithKline

P1/2, N=464, Recruiting, GlaxoSmithKline | Trial completion date: Feb 2028 --> Feb 2029 | Trial primary completion date: Feb 2025 --> Feb 2026

P1; Active, not recruiting --> Completed

GSK3174998±pembrolizumab was well tolerated over the dose range tested and demonstrated target engagement. Limited clinical activity does not support further development of GSK3174998±pembrolizumab in advanced cancers.

A phase I trial (NCT03447314; 204686) evaluated the safety and efficacy of GSK1795091, a Toll-like receptor 4 (TLR4) agonist, in combination with immunotherapy (GSK3174998 [anti-OX40 monoclonal antibody], GSK3359609 [anti-ICOS monoclonal antibody], or pembrolizumab) in patients with solid tumors. Structural characterization revealed GSK1795091 aggregate size in the modified formulation to be twice that in the original formulation, suggesting a negative correlation between GSK1795091 aggregate size and PD activity. This may have important clinical implications for future development of structurally similar compounds.

P1, N=54, Completed, GlaxoSmithKline | Active, not recruiting --> Completed

Sub-study 1 (combination with GSK3174998, OX40 agonist Ab) is closed to enrolment. Sub-studies 2 (combination with GSK3359609, feladilimab, ICOS agonist), 3 (combination with nirogacestat [PF-03084014; SpringWorks Therapeutics], gamma-secretase inhibitor), and 4 (combination with dostarlimab, PD-1 antagonist) are open to enrolment...Nirogacestat and isatuximab produced by and used in collaboration with SpringWorks Therapeutics and Sanofi, respectively. Encore Statement: Presented at 26th Congress of the European Hematology Association (Richardson et al, 2021); submitted with permission of original authors.

P1, N=828, Active, not recruiting, GlaxoSmithKline | Recruiting --> Active, not recruiting | Trial completion date: Dec 2024 --> Jun 2023 | Trial primary completion date: Dec 2024 --> Jun 2023

Belantamab mafodotin (belamaf) is a BCMA-targeted antibody-drug conjugate recently approved as monotherapy for adults with relapsed/refractory multiple myeloma who have received ≥4 prior therapies. Here, we describe the rationale and design of DREAMM-5, an ongoing Phase I/II platform study evaluating the safety and efficacy of belamaf combined with novel agents, including GSK3174998 (OX40 agonist), feladilimab (an ICOS; GSK3359609), nirogacestat (a gamma-secretase inhibitor; PF-03084014) and dostarlimab (a PD-1 blocker) versus belamaf monotherapy for patients with relapsed/refractory multiple myeloma. Clinical trial registration: NCT04126200 (ClinicalTrials.gov).

Substudies 1 (combination with GSK3174998, OX40 agonist antibody), 2 (combination with GSK3359609, ICOS agonist antibody), and 3 (combination with nirogacestat [PF-03084014; SpringWorks Therapeutics], gamma-secretase inhibitor) are currently open to enrollment. Substudy 4 (combination with dostarlimab; PD-1 antagonist antibody) is under review...Funding: GSK (Study 208887); belamaf drug linker technology licensed from Seattle Genetics; belamaf monoclonal antibody produced using POTELLIGENT Technology licensed from BioWa; nirogacestat gamma-secretase inhibitor produced by and used in collaboration with SpringWorks Therapeutics. Figure: DREAMM-5 study design

P1, N=54, Active, not recruiting, GlaxoSmithKline | Suspended --> Active, not recruiting | N=162 --> 54

P1, N=162, Suspended, GlaxoSmithKline | Trial primary completion date: Dec 2021 --> Aug 2020

P1; Trial completion date: Dec 2022 --> Dec 2024 | Trial primary completion date: Dec 2022 --> Dec 2024

Sub-studies 1 (combination with GSK3174998, OX40 agonist antibody) and 2 (combination with GSK3359609, ICOS agonist antibody) are currently enrolling. Sub-study 3 (combination with nirogacestat [PF-03084014; SpringWorks Therapeutics]) is projected to begin enrollment in the first half of 2020...Results - Conclusion - Funding: GlaxoSmithKline (208887). Drug linker technology licensed from Seattle Genetics; monoclonal antibody produced using POTELLIGENT Technology licensed from BioWa.

Sub-studies 1 (combination with GSK3174998, OX40 agonist antibody) and 2 (combination with GSK3359609, ICOS agonist antibody) are currently enrolling. Sub-study 3 (combination with nirogacestat [PF-03084014; SpringWorks Therapeutics]) is projected to begin enrollment in the first half of 2020...Drug linker technology licensed from Seattle Genetics; monoclonal antibody produced using POTELLIGENT Technology licensed from BioWa. Research Funding: GlaxoSmithKline

GSK998 +/- pembrolizumab was well tolerated, with evidence of target engagement; monotherapy clinical activity was limited. While combination responses may not be significantly greater than expected for pembrolizumab alone, responses were observed in some PD-1/L1 experienced pts and some with low PD-L1 expression. Given the low OX40 expression observed and preclinical evidence that increased expression improves activity of OX40 agonism, ongoing clinical evaluation of GSK998 will assess whether concurrent immune-stimulation or immunogenic cell death impacts OX40 expression and increases the efficacy of this agent.

P1, N=162, Suspended, GlaxoSmithKline | Recruiting --> Suspended

P1; N=500 --> 718

Initial substudies will include combinations with the T-cell activating checkpoint mAbs GSK3359609 (an IgG4 inducible T-cell costimulatory [ICOS] agonist antibody that is Fc optimized to selectively enhance T-cell function to enable antitumor responses), GSK3174998 (a humanized wild-type IgG1 anti-OX40 agonistic mAb), and a gamma-secretase inhibitor, Nirogacestat (PF-03084014, SpringWorks Therapeutics). Acknowledgments: Editorial assistance provided by Sarah Hauze, PhD, at Fishawack Indicia Ltd and funded by GSK. Study funded by GSK (208887); drug linker technology licensed from Seattle Genetics; monoclonal antibody produced using POTELLIGENT Technology licensed from BioWa.

P1; Trial completion date: May 2020 --> Dec 2022 | Trial primary completion date: May 2020 --> Dec 2022

P1; N=304 --> 500

P1; Trial primary completion date: Jun 2019 --> May 2020 | Trial completion date: Jun 2019 --> May 2020 | Initiation date: Jun 2016 --> Jun 2016