( nd in human subjects. AVN944 appears to...)Avalon Updates the AVN944 Phase I Hematologic Malignancies Trial,Health

Results from preclinical studies of AVN944 indicate that AVN944 inhibited the proliferation of lymphoid and myeloid cells, the principal cells involved in the most common types of human leukemias. In a single-dose, dose-escalation Phase I clinical trial of AVN944 conducted in the United Kingdom in healthy volunteers, AVN944: (1) was well tolerated at all tested doses with no notable side effects; (2) demonstrated good pharmacokinetic properties; and (3) had a significant inhibitory effect on IMPDH enzyme activity. Avalon filed an IND with the FDA in August 2005 and initiated U.S. Phase I clinical trials in January 2006 for the treatment of hematological cancers.

About Avalon Pharmaceuticals

Avalon Pharmaceuticals is a biopharmaceutical company using its proprietary technology, AvalonRx(R), to discover and develop cancer therapeutics. Avalon has a lead product in Phase I clinical development (AVN944 - IMPDH inhibitor), as well as preclinical programs to discover inhibitors for the beta-catenin and aurora pathways now in late stage lead candidate optimization. Avalon also has discovery programs on modulators of survivin function and a drug discovery program targeting the MYC oncoprotein, one of the most important and previously intractable cancer targets. The company has value generating partnerships with Merck, MedImmune, Medarex, and Novartis. Avalon Pharmaceuticals was established in 1999 and is headquartered in Germantown, Md.

    Contacts:

    Avalon Pharmaceuticals               Russo Partners, LLC

    David D. Muth                        Wendy Lau (Media)

    Executive Vice President &           Tel: (212) 845-4272

    Chief Business Officer

    Tel: (301) 556-9900                  Th
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