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Threshold Announces Clinical Data on TH-302 in Glioblastoma and Relapsed/Refractory Multiple Myeloma to Be Presented at ASCO 2014

Analyst Event With Clinical Experts on Sunday, June 1, 2014

SOUTH SAN FRANCISCO, CA -- (Marketwired) -- 05/14/14 -- Threshold Pharmaceuticals, Inc. (NASDAQ: THLD) today announced that new clinical data from two ongoing Phase 1/2 clinical trials of its investigational hypoxia-activated prodrug, TH-302, will be presented during poster highlight sessions on Friday, May 30, 2014, at the 50th Annual Meeting of the American Society of Clinical Oncology (ASCO), taking place May 30 - June 3, 2014, in Chicago, Illinois. The presentations will report early data from an investigator-sponsored trial evaluating TH-302 with bevacizumab (Avastin®) for the treatment of patients with glioblastoma following bevacizumab failure (Abstract #2029), and from a Company-sponsored trial evaluating TH-302 with low-dose dexamethasone in patients with relapsed/refractory multiple myeloma (Abstract #8534). Abstracts are now available on the ASCO website at http://abstracts.asco.org/. Presentation details are as follows:

Abstract #2029 (Poster #20): Phase 1/2 study of investigational hypoxia-targeted drug, TH-302, and bevacizumab in recurrent glioblastoma following bevacizumab failure; Poster Highlights Session on Central Nervous System Tumors, 1:00 PM - 4:00 PM Central Time, Friday, May 30, 2014, Room E354b; Discussion follows, 4:30 PM - 5:45 PM, Room E450.

Abstract #8534 (Poster #14): Preliminary safety and efficacy of TH-302, an investigational hypoxia-targeted drug, and dexamethasone in patients with relapsed/refractory multiple myeloma; Poster Highlights Session on Lmyphoma and Plasma Cell Disorders, 1:00 PM - 4:00 PM Central Time, Friday, May 30, 2014, in Room S405; Discussion follows, 4:30 PM - 5:45 PM, Room S406.

Evening Reception with Clinical Experts for Investors and Analysts on Sunday, June 1, 2014
Threshold will host an evening reception for investors and analysts on Sunday, June 1, 2014, at 6:00 PM Central Time at the Four Seasons Hotel Chicago to highlight TH-302 data presented at ASCO. Guest speakers include Dr. Paul G. Richardson, Clinical Program Leader, Director of Clinical Research, Jerome Lipper Multiple Myeloma Center, Dana-Farber Cancer Institute, R.J. Corman Professor of Medicine, Harvard Medical School, Boston, Massachusetts, and Dr. Andrew J. Brenner, Clinical Investigator with the Institute for Drug Development at the Cancer Therapy & Research Center at The University of Texas Health Science Center at San Antonio, Texas. RSVP to [email protected].

About TH-302
TH-302 is an investigational hypoxia-activated prodrug that is designed to be activated under tumor hypoxic conditions, a hallmark of many cancers. Areas of low oxygen levels (hypoxia) in solid tumors are due to insufficient blood supply as a result of aberrant vasculature. Similarly, the bone marrow of patients with hematological malignancies has also been shown, in some cases, to be severely hypoxic.

TH-302 is currently under evaluation in two Phase 3 trials: one in combination with doxorubicin versus doxorubicin alone in patients with soft tissue sarcoma, and the other in combination with gemcitabine versus gemcitabine and placebo in patients with advanced pancreatic cancer (MAESTRO). Both Phase 3 trials are being conducted under Special Protocol Agreements with the U.S. Food and Drug Administration (FDA). The FDA and the European Commission have granted TH-302 Orphan Drug Designation for the treatment of soft tissue sarcoma and pancreatic cancer. TH-302 is also being investigated in earlier-stage clinical trials of other solid tumors and hematological malignancies, in combination with chemotherapy and antiangiogenic therapy, and for certain cancers, investigated as a monotherapy.

Threshold has a global license and co-development agreement for TH-302 with Merck KGaA, Darmstadt, Germany, which includes an option for Threshold to co-commercialize in the U.S.

About Threshold Pharmaceuticals

Threshold Pharmaceuticals, Inc. is a biotechnology company focused on the discovery and development of drugs targeting tumor hypoxia, the low oxygen condition found in microenvironments of most solid tumors as well as the bone marrows of some hematologic malignancies. This approach offers broad potential to treat a variety of cancers. By selectively targeting tumor cells, we are building a pipeline of drugs that hold promise to be more effective and less toxic to healthy tissues than conventional anticancer drugs. For additional information, please visit our website (www.thresholdpharm.com).

Forward-Looking Statements

Except for statements of historical fact, the statements in this press release are forward-looking statements, including statements regarding the potential therapeutic uses and benefits of TH-302. These statements involve risks and uncertainties that can cause actual results to differ materially from those in such forward-looking statements. Potential risks and uncertainties include, but are not limited to: the ability of Threshold and Merck KGaA, Darmstadt, Germany, to enroll or complete TH-302 clinical trials; the time and expense required to conduct such clinical trials and analyze data; issues arising in the regulatory or manufacturing process and the results of such clinical trials (including product safety issues and efficacy results); the risk that preclinical studies in animal models of disease may not accurately predict the result of human clinical trials of TH-302; Threshold's and Merck KGaA's (Darmstadt, Germany) dependence on single source suppliers, including the risk that these single source suppliers may be unable to meet clinical supply demands for TH-302 which could significantly delay the development of TH-302; risks related to Threshold's dependence on its collaborative relationship with Merck KGaA, Darmstadt, Germany, including its dependence on decisions by Merck KGaA, Darmstadt, Germany regarding the amount and timing of resource expenditures for the development of TH-302; and Threshold's need for and the availability of resources to develop TH-302 and to support Threshold's operations. Further information regarding these and other risks is included under the heading "Risk Factors" in Threshold's Quarterly Report on Form 10-Q, which has been filed with the Securities and Exchange Commission on May 1, 2014 and is available from the SEC's website (www.sec.gov) and on our website (www.thresholdpharm.com) under the heading "Investors." We undertake no duty to update any forward-looking statement made in this news release.

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