MabVax Therapeutics Announces FDA Authorization to Proceed with HuMab-5B1 in a Phase I Clinical Trial for the Treatment for Pancreatic Cancer

SAN DIEGO, Jan. 4, 2016 /PRNewswire/ -- MabVax Therapeutics Holdings, Inc. (OTCQB: MBVX), a clinical-stage oncology drug development company, announces that it has received notice from the U.S. Food and Drug Administration (FDA) authorizing the initiation a Phase I clinical trial with HuMab-5B1 as a therapeutic treatment for pancreatic cancer. The Company filed an Investigational New Drug (IND) application for its lead fully human antibody product on November 30, 2015. Patient enrollment in the Phase I clinical trial is expected to begin at multiple investigational sites in early 2016.

The Phase I trial will evaluate the safety, tolerability and pharmacokinetics of HuMab-5B1 as a single agent or in combination with a standard of care chemotherapy regimen in subjects with metastatic pancreatic cancer. The first cohort of patients will be enrolled in a traditional dose escalation regimen to assess safety and determine the optimal dose of the antibody. A second patient cohort will establish the safety and optimized dose of the antibody when administered with a standard of care chemotherapy. Two additional patient cohorts will be administered the optimized dose of antibody as a single agent, or in combination with a standard of care chemotherapy regimen, for the treatment of patients with pancreatic cancer.

David Hansen, MabVax's President and Chief Executive Officer, said, "We are delighted with the FDA's expeditious response to our IND filing. We intend to begin the dose escalation portion of this trial as soon as possible and anticipate reporting early safety assessment and determination of a maximum tolerated dose by mid-year 2016. This significant interim milestone will enable us to move into the combination therapy and monotherapy portions of the trial that we expect will provide important pharmacological data. This milestone could also have a positive impact on our future commercial and corporate development activities."

MabVax plans to file a second IND application for a HuMab-5B1 PET imaging agent and, subject to FDA authorization, will begin this Phase I trial in patients with pancreatic cancer in early 2016. 89Zr-HuMab-5B1, which is the antibody combined with a radio-label as a novel PET imaging agent, has demonstrated high image resolution of tumors in established xenograft animal models, making it attractive as a potential companion diagnostic for the HuMab-5B1 therapeutic product.

"Data generated in the early portions of these two Phase I trials could demonstrate important initial safety, targeting specificity and utility of the HuMab-5B1 antibody in patients with this devastating disease," added Mr. Hansen. "We are excited about the potential applicability of our dual-product development approach in other cancers with HuMab-5B1, as well as with follow-on antibodies under development at MabVax."

About HuMab-5B1:

MabVax's HuMab-5B1 antibody is fully human and was discovered from the immune response of cancer patients vaccinated with an antigen-specific vaccine during a Phase I trial at Memorial Sloan Kettering Cancer Center. In preclinical research, the 5B1 antibody has demonstrated high specificity and affinity, and has shown potent cancer cell killing capacity and efficacy in animal models of pancreatic, colon and small cell lung cancers. The antigen the antibody targets is expressed on more than 90% of pancreatic cancers making the antibody potentially broadly applicable to most patients suffering from this type of cancer.

About MabVax:

MabVax Therapeutics Holdings, Inc. is a clinical-stage biotechnology company focused on the development of vaccine and antibody-based products and vaccines to address unmet medical needs in the treatment of cancer. MabVax has discovered a pipeline of human monoclonal antibody products based on the protective immune responses generated by patients who have been immunized against targeted cancers with the Company's proprietary vaccines. MabVax also has the exclusive license to the therapeutic vaccines from Memorial Sloan Kettering Cancer Center. MabVax has two cancer vaccines targeting recurrent sarcoma and ovarian cancer in proof-of-concept Phase II multicenter clinical trials, and a vaccine targeting neuroblastoma that will be ready for a Phase II clinical trial in 2016. Additional information is available at

Forward Looking Statements:

This press release contains "forward-looking statements" regarding matters that are not historical facts, including statements relating to the Company's filing on an IND and product development pipeline. We have no assurance that all of the product development pipeline will be fully developed by the Company. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Words such as "anticipates," "plans," "expects," "intends," "will," "potential," "hope" and similar expressions are intended to identify forward-looking statements. These forward-looking statements are based upon current expectations of the Company and involve assumptions that may never materialize or may prove to be incorrect. Actual results and the timing of events could differ materially from those anticipated in such forward-looking statements as a result of various risks and uncertainties. Detailed information regarding factors that may cause actual results to differ materially from the results expressed or implied by statements in this press release relating to the Company may be found in the Company's periodic filings with the Securities and Exchange Commission, including the factors described in the section entitled "Risk Factors" in its annual report on Form 10-K for the fiscal year ended December 31, 2014, as amended and supplemented from time to time and the Company's Quarter Reports on Form 10-Q and other filings submitted by the Company to the SEC, copies of which may be obtained from the SEC's website at The parties do not undertake any obligation to update forward-looking statements contained in this press release.

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