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Silence Therapeutics Issued Japanese Patent Covering its Core RNA Interference (RNAi) Technology
Date:5/2/2011

LONDON, May 3, 2011 /PRNewswire/ -- Silence Therapeutics plc (AIM: SLN) ("Silence" or the "Company") announces the issuance of patent 4,705,370, titled "Further Novel Forms of Interfering RNA Molecules," by the Japanese Patent Office.  The issued patent covers aspects of Silence's platform of novel, short interfering RNA (siRNA) molecules containing 2'-O-Methyl structures known as AtuRNAi.  Silence's AtuRNAi molecules offer important advantages over conventional siRNA molecules including increased stability and yield, lower manufacturing costs and the absence of toxic metabolites.  Several therapeutics incorporating the company's AtuRNAi technology are currently being studied in five ongoing clinical trials conducted by Silence and other industry leaders.

"The ability to expand our strong RNAi patent portfolio into a large pharmaceutical market such as Japan represents the latest success in our proactive ongoing intellectual property strategy.  Not only does this milestone offer important protection for our RNAi technology in Japan, but it also provides another critical asset to support our efforts to establish valuable partnerships with leaders in the Japanese pharmaceutical industry," stated Philip Haworth, Ph.D., chief executive officer of Silence Therapeutics.  "We believe that this allowance by the Japanese Patent Office coupled with our broad, global protection offered by our core patents will highlight the value of our RNAi therapeutic technology to those Japanese companies with an interest in this exciting area of medicine."

Silence Therapeutics is executing a proactive strategy to continue to build and strengthen a global, diverse and competitive intellectual property portfolio that provides the Company and its partners with a strong proprietary position in the RNAi therapeutics space.  The Company believes that it will continue to make significant progress in these efforts as it expects additional RNAi patents to be issued during 2011.  At present, Silence's global patent portfolio contains issued patents and pending applications covering strategic areas of RNAi therapeutic development including multiple proprietary siRNA delivery technologies, potent siRNA sequences specific for high-value disease targets and key RNAi sequence and chemical modifications.

Notes for editors

About Silence Therapeutics plc (www.silence-therapeutics.com)

Silence Therapeutics plc (AIM: SLN) is a leading global biotechnology company dedicated to the discovery, development and delivery of targeted, systemic RNA interference (RNAi) therapeutics for the treatment of serious diseases.  The company possesses multiple proprietary short interfering RNA (siRNA) delivery technology platforms including AtuPLEX, a system that enables the functional delivery of siRNA molecules to targeted diseased tissues and cells, while increasing their bioavailability and intracellular uptake. Additionally, the company has a platform of novel siRNA molecules, AtuRNAi, which provide a number of advantages over conventional siRNA molecules, including reduced cytokine induction and decreased manufacturing costs.  Silence's unique RNAi assets also include structural features for a next generation of RNAi molecules and additional proprietary siRNA sequences against more than 50 highly valued oncology and other disease targets.

The Company's lead internal drug candidate is Atu027, a liposomal AtuRNAi formulation in clinical development for systemic cancer indications and one of the most clinically advanced RNAi therapeutics in the area of oncology. Silence is currently conducting an open-label, single-centre, dose-escalation Phase I study with Atu027 in patients with advanced solid tumors involving single, as well as, repeated intravenous administration. The study is expected to be completed in the second half of 2011.

The Company's RNAi therapeutic platform has received key validation through multiple partnerships with pharmaceutical companies including AstraZeneca, Dainippon Sumitomo, Pfizer, and Quark. Silence is actively pursuing the establishment of additional partnerships.

Forward-Looking Statements

This press release includes forward-looking statements that are subject to risks, uncertainties and other factors. These risks and uncertainties could cause actual results to differ materially from those referred to in the forward-looking statements. All forward-looking statements are based on information currently available to Silence Therapeutics and Silence Therapeutics assumes no obligation to update any such forward-looking statements.


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SOURCE Silence Therapeutics plc
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