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Tekmira Files for an Injunction in the Supreme Court of British Columbia Seeking Return of Confidential Documents

Vancouver B.C. November 16, 2011 – Tekmira Pharmaceuticals Corporation (Nasdaq: TKMR, TSX: TKM), a leading developer of RNA interference (RNAi) therapeutics, disclosed today that it has filed a Notice of Civil Claim in the Supreme Court of British Columbia against certain individuals from AlCana Technologies, Inc. (“AlCana”) alleging that thousands of confidential documents containing Tekmira’s confidential information and trade secrets were downloaded and taken from Tekmira. Tekmira also filed a Notice of Application seeking an injunction ordering the documents and derivative materials be returned to Tekmira.

Tekmira discovered the alleged document downloading in the course of producing documents in Tekmira’s litigation against Alnylam Pharmaceuticals, Inc. and AlCana in the Massachusetts Superior Court.

In its action, Tekmira alleges that over 10,000 documents containing Tekmira’s confidential information and trade secrets were downloaded from Tekmira’s electronic document management system and used by AlCana to produce lipids belonging to Tekmira, including the lipid MC3. Tekmira is seeking a pre-trial and permanent mandatory injunction ordering the defendants to surrender all confidential information belonging to Tekmira and an injunction prohibiting the defendants from using or disclosing Tekmira’s confidential information to any person or corporation. Tekmira is also seeking general and punitive damages.

About RNAi and Tekmira’s LNP Technology
RNAi therapeutics have the potential to treat a broad number of human diseases by “silencing” disease causing genes. The discoverers of RNAi, a gene silencing mechanism used by all cells, were awarded the 2006 Nobel Prize for Physiology or Medicine. RNAi therapeutics, such as “siRNAs,” require delivery technology to be effective systemically. LNP technology is one of the most widely used siRNA delivery approaches for systemic administration. Tekmira’s LNP technology (formerly referred to as stable nucleic acid-lipid particles or SNALP) encapsulates siRNAs with high efficiency in uniform lipid nanoparticles which are effective in delivering RNAi therapeutics to disease sites in numerous preclinical models. Tekmira’s LNP formulations are manufactured by a proprietary method which is robust, scalable and highly reproducible and LNP-based products have been reviewed by multiple FDA divisions for use in clinical trials. LNP formulations comprise several lipid components that can be adjusted to suit the specific application.

About Tekmira
Tekmira Pharmaceuticals Corporation is a biopharmaceutical company focused on advancing novel RNAi therapeutics and providing its leading lipid nanoparticle delivery technology to pharmaceutical partners. Tekmira has been working in the field of nucleic acid delivery for over a decade and has broad intellectual property covering LNPs. Further information about Tekmira can be found at Tekmira is based in Vancouver, B.C.

Tekmira Forward-looking Statements and Information
This press release contains “forward-looking statements” or “forward-looking information” within the meaning of applicable securities laws (collectively, “forward-looking statements”). Forward-looking statements are generally identifiable by use of the words “believes,” “may,” “plans,” “will,” “anticipates,” “intends,” “budgets,” “could,” “estimates,” “expects,” “forecasts,” “projects,” and similar expressions, and the negative of such expressions. Forward-looking statements in this news release include statements about the nature and prospects of the civil complaint filed against certain individuals from AlCana in the Supreme Court of British Columbia; the complaint filed by Tekmira against Alnylam and AlCana in the Massachusetts Superior Court; and Tekmira's strategy, future operations, clinical trials, prospects and the plans of management; RNAi (ribonucleic acid interference) product development programs.

With respect to the forward-looking statements contained in this news release, Tekmira has made numerous assumptions regarding, among other things: the nature and scope of the civil complaint against AlCana; the nature and prospects of the litigation with Alnylam and AlCana; costs and timing of the litigation with Alnylam and AlCana and the effects of such on Tekmira's financial position and execution of Tekmira's business strategy; LNP's status as a leading RNAi delivery technology; and Tekmira's ability to protect its intellectual property rights and not to infringe on the intellectual property rights of others. While Tekmira considers these assumptions to be reasonable, these assumptions are inherently subject to significant business, economic, competitive, market and social uncertainties and contingencies.

Additionally, there are known and unknown risk factors which could cause Tekmira's actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements contained herein. Known risk factors include, among others: the final outcome of the litigation with certain individuals from AlCana and the litigation with Alnylam and AlCana is not presently determinable or estimable and may result in an outcome that is unfavorable to Tekmira; there may be no basis for which Tekmira has any rights or entitlement to damages from AlCana in the civil complaint or Alnylam and AlCana in the separate action before the Business Litigation Session of the Massachusetts Superior Court in the quantum anticipated by Tekmira, or at all; legal expenses associated with litigation are uncertain and may exceed current estimates, which may have a material adverse effect on Tekmira's financial position and ongoing business strategy; the uncertainty of litigation, including the time and expenses associated therewith; risks and uncertainties involved in the litigation process, such as discovery of new evidence or acceptance of unanticipated or novel legal theories, changes in interpretation of the law due to decisions in other cases, the inherent difficulty in predicting the decisions of judges and juries and the possibility of appeals; the possibility that other organizations have made advancements in RNAi delivery technology that Tekmira is not aware of; future operating results are uncertain and likely to fluctuate; Tekmira's ability to obtain and protect intellectual property rights, and operate without infringing on the intellectual property rights of others; and Tekmira may become subject to product liability or other legal claims for which the Company has made no accrual in its financial statements.

A more complete discussion of the risks and uncertainties facing Tekmira appears in Tekmira's Annual Information Form dated March 30, 2011 and available at All forward-looking statements herein are qualified in their entirety by this cautionary statement, and Tekmira disclaims any obligation to revise or update any such forward-looking statements or to publicly announce the result of any revisions to any of the forward-looking statements contained herein to reflect future results, events or developments, except as required by law.

Contact Information
Jodi Regts
Director, Investor Relations
Phone: 604-419-3234

David Ryan
Longview Communications Inc.
Phone: 416-649-8007

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Posted: November 2011