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Inovio Pharmaceuticals Announces Positive Interim Results in Phase II Leukemia Trial
Date:12/6/2012

n technology. Financial support for the trial is being provided by the UK research charity Leukaemia and Lymphoma Research (LLR) and the Efficacy and Mechanisms Evaluation (EME) programme (which is funded by the UK Medical Research Council and managed by the UK National Institute for Health Research).

Leukemia is a cancer of the bone marrow and blood that accounts for at least 300,000 new cases and 222,000 deaths worldwide each year - a very high death rate. Wilms' Tumor gene 1 (WT1) is highly associated with these types of cancer. Preclinical data from mice showed strong induction of antigen-specific CD8+ T cells and the ability to kill human tumor cells expressing WT1. This is the first study to combine DNA vaccination with electroporation delivery of WT1 antigens with the goal of stimulating high and durable levels of immune responses, in particular T cells, which are considered critical for improving clinical outcomes for this disease.

The principal investigator of this study, Dr. Ottensmeier, said, "These preliminary data show strong vaccine-induced immune responses in vaccinated subjects in the CML arm. We are looking forward to enrolling and testing the vaccine's impact in AML patients, who currently have limited treatment options and a low rate of progression free survival."

In this ongoing phase II trial, all participants initially receive six doses of two DNA vaccines (called p.DOM-WT1-37 and p.DOM-WT1-126) delivered at four week intervals. Vaccine responders may continue with booster vaccinations every three months out to 24 months. An additional 60-75 AML/CML patients are being enrolled across the two arms as non-vaccinated controls for comparison. The primary endpoints are molecular responses to a disease marker called BCR-ABL in CML patients and time to disease progression in AML patients. The study is also monitoring WT1 transcript levels, immune responses to the WT1 antigen, time to progression and overall survival, and two-year
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SOURCE Inovio Pharmaceuticals, Inc.
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