Molecular Templates Announces First Patient Dosed in Phase 1 Trial Evaluating MT-8421, a Novel Engineered Toxin Body Targeting CTLA-4, in Advanced Solid Tumors
AUSTIN, Texas, Nov. 02, 2023 (GLOBE NEWSWIRE) -- Molecular Templates, Inc. (Nasdaq: MTEM, “Molecular Templates,” or “MTEM”), a clinical-stage biopharmaceutical company developing novel therapeutics for oncology with potent differentiated mechanisms of action, today announced that the first patient has been dosed in the Phase 1 clinical trial evaluating MT-8421, a novel engineered toxin body targeting CTLA-4, for the treatment of advanced solid tumors.
The Phase 1 study is a multi-center open-label, dose-escalation, dose-expansion, and a first-in-human study designed to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and the preliminary efficacy of MT-8421. The study will enroll adult patients with tumors where CTLA-4 inhibitors have been proven to provide benefit and in other select tumor types known to frequently have an immune rich tumor microenvironment (“TME”). This will include melanoma, hepatocellular carcinoma (HCC), non-small cell lung cancer (NSCLC), renal cell carcinoma (RCC), Microsatellite Instability-High (MSI-H) / Mismatch Repair Deficient (dMMR) cancer, mesothelioma, esophageal squamous cell carcinoma (ESCC), squamous cell carcinoma of the head and neck (SCCHN), urothelial carcinoma, and cervical carcinoma. Approximately 24-30 patients are anticipated to enroll in Part A dose escalation with a starting dose of 32 mcg/kg.
“MT-8421 represents a unique approach to immuno-oncology in general and CTLA-4 targeting in particular based on its ability to destroy Tregs in the TME but not in the periphery,” said Eric Poma, PhD., Chief Executive and Chief Scientific Officer of Molecular Templates. “We look forward to this approach providing patient benefit in this first-in-human study.”
About MT-8421 (CTLA-4 Targeting ETB)
MT-8421, along with MT-6402 (PD-L1 Targeting ETB with Antigen Seeding Technology), represents our unique approach to immuno-oncology based on dismantling the TME through direct cell-kill of tumor and immune cells and not only the blocking of ligand-ligand interactions seen with current antibody therapeutics. The ETB approach includes potent destruction of CTLA4+ regulatory T cells (“Tregs”) via enzymatic ribosome destruction, and the mechanism of cell kill is independent of TME. MT-8421 preferentially destroys high CTLA4 expressing Tregs in the TME relative to peripheral Tregs which are lower CTLA4 expressing.
About Molecular Templates
Molecular Templates is a clinical-stage biopharmaceutical company focused on the discovery and development of targeted biologic therapeutics. Our proprietary drug platform technology, known as engineered toxin bodies, or ETBs, leverages the resident biology of a genetically engineered form of Shiga-like Toxin A subunit to create novel therapies with potent and differentiated mechanisms of action for cancer.
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Released November 2, 2023