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Threshold Pharma (THLD): TH-302 Drug To Treat Soft Tissue Sarcoma Gets Orphan Drug Designation

 March 16, 2012 09:30 AM
 


Threshold Pharmaceuticals Inc. (NASDAQ:THLD) said the European Commission has granted Orphan Drug Designation for TH-302, a hypoxia-targeted drug, for the treatment of soft tissue sarcoma.

TH-302 is a hypoxia-targeted drug that is thought to be activated under tumor hypoxic conditions, a hallmark of many cancer indications. Areas of low oxygen levels (hypoxia) within tissues are common in many solid tumors due to insufficient blood vessel growth. Similarly, the bone marrow of patients with hematological malignancies has also been shown, in some cases, to be extremely hypoxic.

Sarcomas are a group of aggressive cancers of connective tissue of the body for which there are currently limited treatment options. Soft tissue sarcomas are treated with surgery, chemotherapy and radiation.

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The company is currently conducting a pivotal Phase 3 study in soft tissue sarcoma comparing TH-302 in combination with doxorubicin against single agent doxorubicin.

The same combination regimen of TH-302 with doxorubicin was investigated in the single-arm Phase 2 (TH-CR-403) study. Data from this Phase 2 study were most recently presented at the Connective Tissue Oncology Society (CTOS) meeting in October of 2011.

Doxorubicin as a single agent or in combination with ifosfamide are the most commonly used chemotherapeutic regimens in patients with advanced soft tissue sarcoma, but response rates are generally low and toxicity can be significant.

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In February 2011, Threshold said it had reached agreement with the U.S. Food and Drug Administration on a Special Protocol Assessment for the Phase 3 study (TH-CR-406) which includes a primary efficacy endpoint of overall survival.

The international, randomized, controlled Phase 3 clinical trial was initiated in September 2011, and is being conducted in partnership with the Sarcoma Alliance for Research through Collaboration (SARC). The trial is designed to enroll 450 patients with metastatic or locally advanced unresectable soft tissue sarcoma.

Chief Executive Barry Selick said the Orphan Drug Designation was granted as early studies of TH-302 have shown that it might be of significant benefit for patients with soft tissue sarcoma when combined with doxorubicin.

The American Cancer Society estimates that 10,980 people were diagnosed with a soft tissue sarcoma in the United States in 2011, and about 3,920 people died from the disease. In Europe, it is estimated that more than 32,000 people were diagnosed with soft tissue sarcoma in 2010.

TH-302 has been investigated in over 600 patients in Phase 1/2 clinical trials to date in a broad spectrum of tumor types, both as a monotherapy and in combination with chemotherapy treatments and other targeted cancer drugs.

Threshold has several additional ongoing clinical trials, the most advanced of which is a Phase 3 pivotal study evaluating TH-302 in combination with doxorubicin versus doxorubicin alone in patients with soft tissue sarcoma, and recently completed a Phase 2b trial of TH-302 in combination with gemcitabine versus gemcitabine alone in pancreatic cancer.

THLD closed Thursday's regular trading down 3.72% at $6.73. The stock has been trading between $1.18 and $7.50 for the past 52 weeks.

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