( LOS ANGELES--(BUSINESS WIRE)--Apr 16 2...)ZIOPHARM Presents Data on Orally Active ZIO-201 at AACR,Health

LOS ANGELES--(BUSINESS WIRE)--Apr 16, 2007 - ZIOPHARM Oncology, Inc. (NASDAQ: ZIOP) announced today the presentation of preclinical data for an orally active form of ZIO-201 (isophosphoramide mustard - IPM) at the American Association of Cancer Research meeting being held in Los Angeles. Data presented demonstrated oral availability of ZIO-201 and activity in a variety of cancer models, including those with ifosfamide (IFOS) and cyclophosphamide resistant tumors. An oral form of IPM, the primary therapeutic component of IFOS, without the toxic metabolites of IFOS, could extend the therapeutic utility of ZIO-201 well beyond that of IFOS.

"Ifosfamide has been tested as an oral drug but it is problematic at effective doses because of toxicity. Both an oral and IV form of ZIO-201 may offer clinicians an effective alternative to IFOS without the debilitating side effects associated with the other metabolites of IFOS," commented Barbara Wallner, Ph.D., Chief Technical Officer at ZIOPHARM.

About ZIO-201

ZIO-201, the active moiety of IFOS, is a bi-functional alkylator that causes irreparable inter-strand DNA cross-linking resulting in cell death. ZIO-201 is equal to or more active than IFOS in diverse cancer models. Unlike IFOS, which is a pro-drug, ZIO-201 is directly active against cancer cells. Also, unlike IFOS, ZIO-201 is not metabolized to acrolein or chloroacetaldehyde which cause bladder or central nervous system toxicities. ZIO-201 continues in a phase I trial in diverse cancers exploring maximum tolerated dose at alternate schedules. A phase II trial in advanced sarcoma continues to enroll patients. Trials in lymphoma and pediatric cancers are in the advanced planning stage. An oral form of ZIO-201 is in advanced preclinical development.

About ZIOPHARM Oncology, Inc.

ZIOPHARM Oncology, Inc. is a biopharmaceutical company engaged in the development and commercialization of a diverse
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