Today, Threshold presented additional data from its analysis of the randomized, double-blind Phase 3 MAESTRO clinical trial of evofosfamide (TH-302) in combination with gemcitabine in previously untreated patients with metastatic or locally advanced unresectable pancreatic ductal adenocarcinoma conducted by Merck KGaA. A meaningful improvement in overall survival was reported for the subgroup of 123 Asian patients enrolled at Japanese and South Korean sites in which the risk of death was reduced by 48 percent for patients on the treatment arm compared to patients on the control arm with an associated stratified hazard ratio of 0.52 (95% CI: 0.32 - 0.85). The patients from
Randomized, Double-Blind, Placebo-Controlled Trial of Evofosfamide and Pemetrexed in Second Line Advanced Non-Squamous Non-Small Cell
As reported in
Evofosfamide combined with gemcitabine/nab-paclitaxel in patients with previously untreated locally advanced or metastatic pancreatic adenocarcinoma (PAC): results of a phase I trial. Borad et al. (abstract 4114).
Nineteen patients were treated for a median of 6 cycles. The maximum tolerated dose of evofosfamide was established at 340 mg/m2 in combination with 800 mg/m2 gemcitabine and 100 mg/m2 nab-paclitaxel. No new safety signals were identified with myelosuppression being the primary dose limiting toxicity. The best response rate was 53 percent and the confirmed response rate was 37 percent.
Two additional trials-in-progress posters were also displayed:
A Phase 2 Study of Tarloxotinib Bromide (TRLX) in Patients with Recurrant or Metastatic Squamous Cell Carcinoma of the Head and Neck (SCCHN) or Skin (SCCS).
Rischin et al. (abstract TPS6105)
A Phase 2 Study (NCT02454842) of Tarloxotinib Bromide (TH-4000) in Patients with EGFR Mutant, T790M-Negative, Advanced NSCLC Progressing on an EGFR TKI.
Liu et al. (abstract TPS9100)
Copies of the posters may be obtained from Threshold's website, www.thresholdpharm.com, under
Evofosfamide (previously known as TH-302) is an investigational hypoxia-activated prodrug of a bis-alkylating agent that is preferentially activated under severe hypoxic tumor conditions, a feature of many solid tumors. Areas of low oxygen levels (hypoxia) in solid tumors are due to insufficient blood vessel supply. Similarly, the bone marrow of patients with hematological malignancies has also been shown, in some cases, to be severely hypoxic. On
About Tarloxotinib Bromide
Tarloxotinib bromide (the proposed International Nonproprietary Name, previously known as TH-4000), or "tarloxotinib", is a prodrug designed to selectively release a covalent (irreversible) EGFR tyrosine kinase inhibitor under severe hypoxia, a feature of many solid tumors. Accordingly, tarloxotinib has the potential to effectively shut down aberrant EGFR signaling in a tumor-selective manner, thus potentially avoiding or reducing the systemic side effects associated with currently available EGFR tyrosine kinase inhibitors. Tarloxotinib is currently being evaluated in two Phase 2 proof-of-concept trials: one for the treatment of patients with mutant EGFR-positive, T790M-negative advanced non-small cell lung cancer progressing on an EGFR tyrosine kinase inhibitor, and the other for patients with recurrent or metastatic squamous cell carcinomas of the head and neck or skin. Threshold licensed exclusive worldwide rights to tarloxotinib from the
Threshold is a clinical-stage biopharmaceutical company focused on the discovery and development of drugs and diagnostic agents 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 the Company's website.
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 its product candidates, evofosfamide and tarloxotinib, including statements related to potential clinical and regulatory paths forward for our product candidates. 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 difficulty and uncertainty of pharmaceutical product development, including the time and expense required to conduct clinical trials and analyze data, and the uncertainty of clinical success and regulatory approval; issues arising in the regulatory or manufacturing process and the results of such clinical trials (including safety issues and efficacy results); the dependence of Threshold on single source suppliers for evofosfamide, including the risk that these single source suppliers may be unable to meet clinical supply demands for evofosfamide which could significantly delay the development of evofosfamide; the amount and timing of resource expenditures for the development of evofosfamide; the commencement of additional clinical trials; and Threshold's need for and the availability of resources to develop its drug candidates 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
Denise Powelldenise@redhousecomms.com 510.703.9491
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