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Anadys Pharmaceuticals Commences Phase I Clinical Trial of ANA773 in Cancer Patients
Date:2/28/2008

developing ANA773 as a novel therapy for patients with cancer. We anticipate identifying the dose and schedule for Phase II investigation by the end of this year."

About ANA773

ANA773 is an orally administered prodrug of a novel TLR7-specific agonist. Pharmacology studies have shown that ANA773 can elicit desired immune responses and components of the response can be modulated by both dose and schedule of administration.

Data presented at the AACR-NCI-EORTC meeting in October 2007 showed that activation of TLR7 by the biologically active metabolite of ANA773 initiates a cascade of immune stimulatory events that has the potential to mediate anti-tumor activity by the induction of cytolytic activity by CD8 T cells against tumor cells and cytolytic activity of NK cells against tumor cells directly or through antibody-dependent cellular cytotoxicity (ADCC). Anadys also demonstrated that the immunostimulatory responses can be modulated by schedule of administration. Earlier in 2007, data presented at the AACR meeting showed that ANA773 and its active metabolite stimulate secretion of interferon alpha and other cytokines as well as enhance rituximab-mediated ADCC against transformed B cells.

About TLR7 agonists in cancer therapy

The potential benefits of the TLR7 mechanism in cancer therapy arise from the fundamental role of this receptor in immune activation. The host immune system, once activated, plays an essential role in controlling the ability of cancer cells to grow, invade and metastasize. Immunotherapy has had some success in treating selected tumors, and the potential to harness the immune system as a therapeutic modality remains of great interest to many oncologists.

TLR7 agonists are of particular interest because there is precedent for their use in cancer. Small molecule ligands for this receptor have been identified, including topical imiquimod (Aldara(R)) which is approved for the treatment of basal cell carcinoma i
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SOURCE Anadys Pharmaceuticals, Inc.
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