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Additional Listing

20 Dec 2011 07:00

FOR IMMEDIATE RELEASE

Additional Listing

London, December 20, 2011 - Silence Therapeutics plc (AIM: SLN) ("Silence" or the "Company") a leading global RNA interference (RNAi) therapeutics company, today announces that application has been sought for 530,000 new ordinary shares of 1 pence each ("Ordinary Shares") to be admitted to trading on AIM. The new Ordinary Shares are being issued in accordance with a contractual agreement with Dr. Philip Haworth, former Chief Executive Officer of Silence.

It is expected that dealings in the new Ordinary Shares, which will rank pari passu in all respects with the existing issued share capital of the Company, will commence on 21 December 2011.

--Ends--

For further information, please contact:

Silence Therapeutics Singer Capital Markets Thomas Christ©ly/Max Herrmann Shaun Dobson/Claes Sp¥ng +49 30 9489 2800/+44 20 7491 6520 +44 20 3205 7500 t.christely@silence-therapeutics.com shaun.dobson@singercm.com m.herrmann@silence-therapeutics.com claes.spang@singercm.com M:Communications (Europe) Peter Laing / Emma Thompson / Claire Dickinson +44 20 7920 2345 / +44 20 7920 2342 healthcare@mcomgroup.com Notes for editors

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

Silence Therapeutics plc (AIM: SLN) is a leading biotechnology company dedicated to the discovery, development and delivery of targeted, systemic RNA interference (RNAi) therapeutics for the treatment of serious diseases. Silence offers one of the most comprehensive short interfering RNA (siRNA) therapeutic platforms available today based on a strong intellectual property portfolio and large clinical safety database. Silence's clinical siRNA product pipeline is one of the broadest in the industry.

The Company possesses multiple proprietary siRNA delivery technology platforms including AtuPLEXâ„¢, DACC and DBTC. AtuPLEX enables the broad functional delivery of siRNA molecules to targeted diseased tissues and cells, while increasing their bioavailability and intracellular uptake. The DACC delivery system allows functional delivery of siRNA molecules selectively to the lung endo-thelium with a long duration of target mRNA and protein knock-down. The DBTC delivery system enables functional delivery of siRNA molecules selectively to liver cells including hepatocytes.

Additionally, the Company has a platform of novel siRNA molecules based around its AtuRNAi chemical modification technology, which provides a number of advantages over conventional siRNA molecules. Silence's unique RNAi assets also include structural features for RNAi molecules and specific design rules for increased potency and reduced off-target effects of siRNA sequences.

The Company's lead internal drug candidate is Atu027, a liposomal formulation in clinical development for systemic cancer indications and one of the most clinically advanced RNAi therapeutic candidates in the area of oncology. Atu027 incorporates two of the Company's technologies, AtuRNAi and AtuPLEXâ„¢. 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. Encouraging interim safety and pharmacokinetic data were presented at the American Society of Clinical Oncology Annual Meeting in June 2011. The study is expected to be completed in the first half of 2012.

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

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Date   Source Headline
6th Oct 20107:00 amRNSForm 8.3 - Silence Therapeutics Plc
5th Oct 20102:08 pmRNSForm 8.3 - Silence Therapeutics PLC
4th Oct 20107:00 amRNSMP Healthcare Form 8.3 - Silence Therapeutics Plc
1st Oct 20103:19 pmRNSForm 8.3 - Silence Therapeutics plc
1st Oct 20107:00 amRNSForm 8.3 - Silence Therapeutics
30th Sep 20101:48 pmRNSForm 8.3 - [Silence Therapeutics]
29th Sep 20107:00 amPRNForm 8.3 - Silence Therapeutics plc
23rd Sep 20102:45 pmPRNForm 8.3 - Silence Therapeutics Plc
22nd Sep 20102:42 pmPRNForm 8.3 - Silence Therapeutics plc
21st Sep 20101:38 pmRNSForm 8.3 - Silence Therapeutics
20th Sep 20107:00 amRNSHalf Yearly Report
15th Sep 20102:54 pmPRNForm 8.3 - Silence Therapeutics plc
15th Sep 20107:00 amRNSMP Healthcare Form 8.3 - Silence Therapeutics Plc
14th Sep 20103:12 pmPRNForm 8.3 - Silence Therapeutics
14th Sep 201011:22 amRNSForm 8.3 - Silence Therapeutics plc
14th Sep 20109:45 amRNSForm 8.5 (EPT/NON-RI)
14th Sep 20107:00 amRNSChange of Adviser
13th Sep 20101:45 pmRNSForm 8.5 (EPT/NON-RI)
10th Sep 20103:24 pmRNSMP Healthcare Form 8.3 - Silence Therapeutics Plc
10th Sep 20102:06 pmRNSForm 8 (OPD) - Silence Therapeutics plc
10th Sep 201011:19 amRNSForm 8.5 (EPT/NON-RI)
9th Sep 201011:48 amRNSForm 8.5 (EPT/NON-RI)
8th Sep 20104:23 pmRNSForm 8.5 - Silence Therapeutics PLC
8th Sep 20103:12 pmPRNForm 8.3 - Silence Therapeutics PLC
8th Sep 20102:43 pmRNSForm 8.3 - SILENCE THERAPEUTICS PLC
8th Sep 20101:35 pmRNSForm 8.3 - [Silence Therapeutics Plc Amendment]
8th Sep 20101:02 pmRNSForm 8.3 - Silence Therapeutics plc
8th Sep 20101:00 pmRNSForm 8.3 - Silence Therapeutics Plc
8th Sep 201012:42 pmRNSForm 8.3 - [Silence Therapeutics Plc)
8th Sep 201011:09 amRNSForm 8.5 (EPT/NON-RI)
8th Sep 20107:00 amRNSNon Regulatory - Patent Issuance
7th Sep 20103:13 pmRNSForm 8.3 - Silence Therapeutics Plc
7th Sep 20102:41 pmRNSForm 8.3 - Silence Therapeutics plc
7th Sep 20102:39 pmPRNForm 8.3 - Silence Therapeutics Plc
7th Sep 201012:46 pmRNSForm 8.3 - Silence Therapeutics plc
7th Sep 201012:19 pmRNSForm 8.5 - Silence Therapeutics Plc (amendment)
7th Sep 201011:53 amRNSForm 8.5 - Silence Therapeutics
7th Sep 201010:58 amRNSForm 8.5 (EPT/NON-RI)
6th Sep 20104:40 pmRNSSecond Price Monitoring Extn
6th Sep 20104:35 pmRNSPrice Monitoring Extension
6th Sep 20103:14 pmRNSPotential Offer
19th Aug 20104:35 pmRNSExclusive option agreement with Novartis
18th Aug 20107:00 amRNSChange of Auditor and Notice of Interim Results
11th Aug 20107:00 amRNSZamore Patent Issuance
14th Jul 20102:32 pmRNSHolding(s) in Company
14th Jul 20107:00 amRNSCollaboraton extension with AstraZeneca
9th Jul 20104:35 pmRNSPrice Monitoring Extension
18th Jun 201012:51 pmPRNAll Resolutions Passed at Silence's (AIM: SLN) AGM
11th May 20107:00 amPRNSilence (AIM:SLN) to Present at Investor Conferences
29th Apr 20107:00 amPRNFinal Results

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