( PUNTA DEL ESTE Uruguay--(BUSINESS WIRE...)ZIOPHARM Presents ZIO-201 Lymphoma Data at ISH,Health

PUNTA DEL ESTE, Uruguay--(BUSINESS WIRE)--Mar 23, 2007 - ZIOPHARM Oncology, Inc. (NASDAQ: ZIOP) announced today the presentation of data on ZIO-201 at the XXXI World Congress of the International Society of Hematology (ISH) meeting being held in Punta del Este, Uruguay. ZIO-201 is a proprietary form of the therapeutic active metabolite of ifosfamide (IFOS), a drug that is widely used in the treatment of lymphoma. However, IFOS can be problematic in treating lymphoma as certain IFOS metabolites cause debilitating bladder toxicity and confusion. Further, there is a variability in treatment effect associated with the metabolism of IFOS and resistance can develop. The Company believes that ZIO-201 could better deliver the clinical benefits of IFOS without the associated toxicities and the development of resistance.

Data presented at ISH yesterday highlighted that ZIO-201 was 10 to 30 fold more active than IFOS in most in vitro and in vivo models of lymphoma. ZIO-201 also killed IFOS-resistant lymphoma in cancer-bearing mice. In a phase I clinical study, there was little bone marrow toxicity and no hemorrhagic cystitis (bladder toxicity) or central nervous system (CNS) toxicity (confusion). The dose limiting toxicity was characterized by renal electrolyte imbalances. The maximum dose administered was equivalent to high-dose IFOS. Because of the modest bone marrow toxicity, ZIO-201 can be given to patients with bone marrow failure, an important distinction from IFOS in the treatment of patients with lymphoma. A phase II study of ZIO-201 in the treatment of lymphoma will begin later this year.

"These results with ZIO-201 are encouraging," commented Dr. Brian Schwartz, Chief Medical Officer at ZIOPHARM. "Avoiding the more serious toxicities associated with the administration of ifosfamide in addition to having the potential to treat resistant lymphoma patients with ZIO-201 could be an important step forward in r
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