On June 27, 2017 MabVax Therapeutics Holdings, Inc. (Nasdaq: MBVX), a clinical-stage oncology drug development company with a fully human antibody discovery platform focused on the rapid translation into clinical development of products to address unmet medical needs in the treatment of cancer, reported that the first patient has been dosed in the Phase 1 clinical trial evaluating MVT-1075, the Company’s fully human antibody radioimmunotherapy (RIT), for the treatment of CA19-9 positive malignancies including pancreatic, colon and lung cancers.

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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 up to 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 will include Honor Health in Scottsdale, Arizona and Memorial Sloan Kettering Cancer Center in New York City.

"MabVax is pleased to announce that we have advanced into the clinic with the dosing of the first patient in our MVT-1075 RIT lead development program. This significant milestone is a tribute to the integrated collaboration of our research and development staff with our clinical collaborators to bring this potentially life-changing therapy to patients with pancreatic, colon and small cell lung cancers," said David Hansen, MabVax’s President and Chief Executive Officer. "This is the third HuMab-5B1 based clinical trial that the Company has initiated in the last sixteen months. We believe that the development of this product candidate expands our pipeline to include a more potent therapy combining the clinically demonstrated tumor targeting characteristics of our fully human HuMab-5B1 antibody and commercially validated 177Lutetium, to deliver a dose of radiation to the targeted cancer cells. We look forward to continuing enrollment, and expect to report interim trial results by the end of 2017."

Supporting the MVT-1075 RIT clinical investigation are the Company’s successful Phase 1a safety and target specificity data reported 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) earlier this month, including the clinical results for the Company’s HuMab-5B1 products, MVT-5873, a single agent therapeutic antibody and MVT-2163, an immuno-PET imaging agent. The combined results from 50 patients in the Phase 1 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. 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.

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.