On December 13, 2017 MabVax Therapeutics Holdings, Inc. (Nasdaq: MBVX), a clinical-stage biotechnology company focused on the development of antibody-based products to address unmet medical needs in the treatment of cancer, reported the completion of enrollment and dosing of all patients in the initial cohort of the Phase 1 clinical trial evaluating the Company’s new human antibody-based radioimmunotherapy ("RIT") product MVT-1075 for the treatment of pancreatic, colon and lung cancer (Press release, MabVax, DEC 13, 2017, View Source [SID1234522631]).
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This Phase 1 first-in-human clinical trial is an open-label, multi-center study evaluating the safety and efficacy of MVT-1075 in approximately 22 patients with CA19-9 positive malignancies in the U.S. The primary objective is to determine the maximum tolerated dose and safety profile in patients with recurring disease who have failed prior therapies. Secondary endpoints are to evaluate tumor response rate and duration of response by RECIST 1.1, and to determine dosimetry and pharmacokinetics. This dose-escalation study utilizes a traditional 3+3 design. The investigative sites include Honor Health in Scottsdale, Arizona and Memorial Sloan Kettering Cancer Center in New York City. The Company plans to report interim results from this study early in the first quarter of 2018 and continue the dose escalation phase of the program.
In April, the Company reported preclinical results for MVT-1075 at the American Association of Clinical Research (AACR) (Free AACR Whitepaper) Annual Meeting, demonstrating marked suppression, and in some instances, regression of tumor growth in xenograft animal models of pancreatic cancer, potentially making this product an important new therapeutic agent in the treatment of pancreatic, colon and lung cancers. Supporting the MVT-1075 RIT clinical investigation are the Company’s successful Phase 1a safety and target specificity data which were reported earlier this year at the annual meetings of the American Society for Clinical Oncology (ASCO) (Free ASCO Whitepaper) and the Society for Nuclear Medicine and Molecular Imaging (SNMMI), including the clinical results for the Company’s MVT-5873 single agent therapeutic antibody and MVT-2163, an immuno-PET imaging agent. The combined results from 50 patients in the Phase 1a MVT-5873 and MVT-2163 studies, established safety and provided significant insight into drug biodistribution and an optimal dosing strategy, which the Company has incorporated into the MVT-1075 program.
MVT-1075 combines the clinically demonstrated tumor targeting characteristics of the Company’s fully human HuMab-5B1 antibody and the commercially validated radionuclide, 177Lutetium, for the purpose of delivering a lethal dose of radiation to the targeted cancer cells.
For additional information about the Phase 1 MVT-1075 clinical trial, please visit clinicaltrials.gov, and reference Identifier NCT03118349.
About MVT-1075
MVT-1075 is a radioimmunotherapy product that combines established efficacy of radiation therapy with tumor specific targeting. It has the potential to deliver a more potent HuMab-5B1 based product. MVT-1075 uses small doses of the Company’s MVT-5873 antibody, coupled to a radioisotope to target pancreatic cancer cells and kill them.