4D Molecular Therapeutics Presents Interim Data from 4D-310 INGLAXA Phase 1/2 Clinical Trials & Development Plans for Fabry Disease Cardiomyopathy at WORLDSymposium™

23 Feb 2023
pipelinereview.com
Gene TherapyClinical StudyClinical Result
EMERYVILLE, CA, USA I February 22, 2023 I 4D Molecular Therapeutics (Nasdaq: FDMT, ‘4DMT’), a clinical-stage biotherapeutics company harnessing the power of directed evolution for targeted genetic medicines, today announced updated interim safety and efficacy data from the two 4D-310 INGLAXA Phase 1/2 clinical trials for Fabry disease cardiomyopathy. All three patients with 12 months of follow-up demonstrated improvement on cardiac contractility, exercise capacity and quality of life endpoints. Treatment was generally well tolerated, with transient acute aHUS being the only significant adverse event. Following a detailed investigation into the etiology of aHUS, 4DMT is engaging with the FDA to resume enrollment based on updated exclusion criteria and the highly effective rituximab/sirolimus immunosuppressive regimen. Data will also be presented at the WORLDSymposium™ 2023 in Orlando, Florida on February 25th, 2023.
“As demonstrated by the positive cardiac outcomes and biopsy biomarker data, these clinical proof-of-concept results with 4D-310 mark another important milestone for 4DMT,” said David Kirn, M.D., Co-founder and Chief Executive Officer of 4DMT. “This is our third proprietary vector that has been validated in clinical trials across three different therapeutic areas, which further validates our Therapeutic Vector Evolution platform. We are developing 4D-310 for the treatment of Fabry disease cardiomyopathy, which is the primary cause of death and not addressed by current therapies. In addition, our focus on patient safety led us to voluntarily pause enrollment on our two INGLAXA trials in January 2023 after observing an aHUS dose-limiting toxicity, and FDA subsequently put the program on clinical hold. Following an in-depth investigation in collaboration with world experts in immunology and AAV gene therapy to understand and mitigate aHUS, we are confident that the rituximab and sirolimus immunosuppressive regimen and updated exclusion criteria will mitigate safety risks and potentially further improve patient benefit.”
INGLAXA Phase 1/2 Clinical Trials Design
Cardiac Outcomes
4D-310 Cardiac clinical endpoints results summary (data cut-off date of December 5, 2022):
Safety and Tolerability
Next Steps for Development of 4D-310
4D-310 utilizes the targeted and customized C102 vector to efficiently deliver a functional copy of the GLA gene and was designed for a unique mechanism of action, specifically to directly correct the AGA enzyme function within cardiomyocytes (heart muscle cells) after a single low dose IV administration. C102 was invented at 4DMT through our proprietary Therapeutic Vector Evolution platform; we created this platform utilizing principles of directed evolution, a Nobel Prize-winning technology. The product is designed to generate both high local production of AGA directly within critically affected organs, including heart, blood vessels and kidney, as well as the potential for systemic tissue cross-correction. This product design has the potential to treat and potentially reverse the cardiomyopathy in Fabry patients which is the leading cause of death, as well as other significant unmet medical needs in patients with Fabry disease.
Affecting more than 50,000 people in the United States and European Union, Fabry disease is a genetic disorder of the GLA gene that results in the body’s inability to produce an enzyme called alpha-galactosidase or AGA, causing accumulation of the substrate globotriaosylceramide (Gb3) in critical organs, including the heart, kidney, and blood vessels. Such substrate accumulation can lead to life-threatening hypertrophic cardiomyopathy, heart failure, arrhythmias, various degrees of kidney dysfunction and cerebrovascular stroke. Fabry disease progression results in increased morbidity, mortality and cost of care. Significant unmet medical needs remain for these patients despite enzyme replacement therapy (ERT), the current standard of care. ERT requires biweekly intravenous dosing which markedly decreases patients’ quality of life. In addition, while benefit has been demonstrated in the kidney, ERT has not been shown to clearly benefit the heart. Cardiovascular disease remains the leading cause of death and disability in Fabry disease patients.
About 4DMT
4DMT is a clinical-stage biotherapeutics company harnessing the power of directed evolution for targeted genetic medicines. 4DMT seeks to unlock the full potential of genetic medicines using its proprietary invention platform, Therapeutic Vector Evolution, which combines the power of the Nobel Prize-winning technology, directed evolution, with approximately one billion synthetic AAV capsid-derived sequences to invent targeted and evolved vectors for use in our product candidates. All of our vectors are proprietary to 4DMT and were invented at 4DMT, including the vectors utilized in our clinical-stage and preclinical pipeline product candidates: R100, A101, and C102. The Company is initially focused on five clinical-stage product candidates in three therapeutic areas for both rare and large market diseases: ophthalmology, pulmonology, and cardiology (Fabry disease cardiomyopathy). The 4DMT targeted and evolved vectors were invented with the goal of being delivered at relatively low doses through clinically routine, well-tolerated, and minimally invasive routes of administration, transducing diseased cells in target tissues efficiently, having reduced immunogenicity and, where relevant, having resistance to pre-existing antibodies. 4DMT is currently advancing five product candidates in clinical development: 4D-150 for wet AMDAMD and DME, 4D-710 for cystic fibrosis lung disease, 4D-310 for Fabry disease cardiomyopathy, 4D-125 for XLRP, and 4D-110 for choroideremia. The 4D preclinical product candidates in development are: 4D-175 for geographic atrophy and 4D-725 for alpha-1 antitrypsin deficiencyalpha-1 antitrypsin deficiency.
4D-150, 4D-710, 4D-310, 4D-125, and 4D-110 are our product candidates in clinical development and have not yet been approved for marketing by the US FDA or any other regulatory authority. No representation is made as to the safety or effectiveness of 4D-150, 4D-710, 4D-310, 4D-125, or 4D-110 for the therapeutic uses for which they are being studied.
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