Tekmira's Lipid Nanoparticle (LNP) Technology Highlighted in Two Peer-Reviewed Scientific Publications

Tekmira's Lipid Nanoparticle (LNP) Technology Highlighted in Two Peer-Reviewed
Scientific Publications

Published Data Shows 100% Protection Against Multiple Strains of Marburg Virus
     in Animal Model Using RNAi Therapeutic Developed by Tekmira and Its
                                Collaborators

ALN-TTR Results Enabled by Tekmira's LNP Technology as Highlighted in the New
 England Journal of Medicine Provide Robust Proof of Concept for RNAi Therapy
                                    in Man

VANCOUVER, British Columbia, Aug. 30, 2013 (GLOBE NEWSWIRE) -- Tekmira
Pharmaceuticals Corporation (Nasdaq:TKMR) (TSX:TKM), a leading developer of
RNA interference (RNAi) therapeutics, announced the publication of two
articles in peer-reviewed scientific journals – the Journal of Infectious
Diseases and New England Journal of Medicine – that highlight results enabled
by Tekmira's lipid nanoparticle (LNP) technology.

"These recently published data further validate the broad applicability of
Tekmira's industry-leading LNP technology platform. Our work with our
collaborators at UTMB has resulted in the first report of complete
post-exposure protection against the most pathogenic strain of Marburg virus.
These findings build upon our work in infectious diseases – including our
TKM-Ebola program, an anti-Ebola viral therapeutic currently in development
under a $140 million contract awarded by the U.S. Government and entering a
Phase I clinical trial early in 2014 – and provide a foundation for future
infectious disease therapeutics," said Dr. Mark J. Murray, Tekmira's President
and CEO.

"Tekmira's LNP technology is also enabling the rapid, dose-dependent, durable,
and specific knockdown of TTR in clinical trials of Alnylam's ALN-TTR01 and
ALN-TTR02 RNAi therapeutic products. Specifically, the ALN-TTR02 data points
to our LNP delivery technology providing improved potency and demonstrating up
to a 94% reduction of serum TTR with ALN-TTR02," added Dr. Murray.

The study published in the Journal of Infectious Diseases results from a
collaboration between Tekmira and the University of Texas Medical Branch
(UTMB). The paper, entitled "Protection against Lethal Marburg Virus Infection
Mediated by Lipid Encapsulated siRNA" showed 100% protection in guinea pig
models against the Angola, Ci67 and Ravn strains of the Marburg virus using a
broad spectrum RNAi therapeutic enabled by Tekmira's LNP (Ursic-Bedoya et al.,
J Infect Dis.  (2013) [Online early access]. doi: 10.1093/infdis/jit465. First
published online: August 29, 2013).

In 2010, Tekmira and UTMB were awarded a National Institutes of Health (NIH)
grant to support research to develop RNAi therapeutics to treat Ebola and
Marburg hemorrhagic fever viral infections. The grant is supporting ongoing
work at Tekmira and at UTMB including work advancing these promising results
into non-human primates.

Complete study results from Phase I trials with ALN-TTR01 and ALN-TTR02 were
published in the New England Journal of Medicine in a paper entitled "Safety
and Efficacy of RNAi Therapy for Transthyretin Amyloidosis" (Coelho et al., N
Engl J Med 2013; 369:819-29). ALN-TTR01 and ALN-TTR02 are systemically
delivered RNAi therapeutics that use Tekmira's LNP technology and target
transthyretin (TTR), the disease-causing protein in TTR-mediated amyloidosis
(ATTR). ALN-TTR01 and ALN-TTR02 are being developed by Alnylam
Pharmaceuticals, Inc. (Nasdaq:ALNY). More detailed information about the Phase
I trials with ALN-TTR01 and ALN-TTR02 can be found in Alnylam's news release
dated August 28, 2013, which has been posted at www.alnylam.com.

Tekmira has granted Alnylam a license to use Tekmira's LNP technology to
advance RNAi therapeutic products, and Tekmira is eligible to receive
milestones and royalties as Alnylam's LNP enabled products are developed and
commercialized. Tekmira is entitled to receive a $5 million milestone payment
when ALN-TTR02 enters a pivotal or Phase III clinical trial, which Alnylam has
guided should occur by the end of 2013. Tekmira is eligible to receive royalty
payments based on commercial sales of ALN-TTR02.

About RNAi and Tekmira's LNP

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. Tekmira believes its LNP technology
represents the most widely adopted delivery technology for the systemic
delivery of RNAi therapeutics. Tekmira's LNP platform is being utilized in
multiple clinical trials by both Tekmira and its partners. Tekmira's LNP
technology (formerly referred to as stable nucleic acid-lipid particles or
SNALP) encapsulates siRNAs with high efficiency in uniform lipid nanoparticles
that 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 www.tekmirapharm.com. Tekmira is based in Vancouver, B.C.

Forward-Looking Statements and Information

This news 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 Tekmira's
strategy, future operations, clinical trials, prospects and the plans of
management; RNAi (ribonucleic acid interference) product development programs;
Tekmira's collaboration with UTMB; the first reported results of complete
post-exposure protection against the most pathogenic strain of Marburg virus;
the expected initiation of a Phase I clinical trial for TKM-Ebola; Alnylam's
ALN-TTR product development programs; the development timeline and expected
milestone payments associated with Alnylam's ALN-TTR program; the advancement
of products that utilize Tekmira's lipid nanoparticle technology; expectations
regarding the advancement of multiple product candidates; the quantum and
timing of further clinical data being presented for LNP-enabled products;
continued innovation and protection of LNP technology; timing of the
initiation of clinical trials and release of clinical data from Tekmira's
product candidates; the quantum and timing of potential milestone and royalty
payments; and the use of lipid nanoparticle technology by Tekmira's licensees.

With respect to the forward-looking statements contained in this news release,
Tekmira has made numerous assumptions regarding, among other things: LNP's
status as a leading RNAi delivery technology; the effectiveness of Tekmira's
products as a treatment for infectious disease, or other diseases; results in
preclinical models are indicative of the potential effect in humans; Tekmira's
research and development capabilities and resources; FDA approval with respect
to commencing clinical trials; the timing and obtaining of regulatory
approvals for Tekmira's products; the timing and results of clinical data
releases and use of LNP technology by Tekmira's development partners and
licensees; the time required to complete research and product development
activities; the timing and quantum of payments to be received under contracts
with Tekmira's partners, including Alnylam; Tekmira's financial position and
its ability to execute on its business strategy; 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: Tekmira's research and development capabilities and
resources may not meet current or expected demand; Tekmira's products may not
prove to be effective in the treatment of infectious disease, or other
diseases; Tekmira may not obtain and protect intellectual property rights, and
operate without infringing on the intellectual property rights of others;
Tekmira may face competition from other pharmaceutical or biotechnology
companies and the possibility that other organizations have made advancements
in RNAi delivery technology that Tekmira is not aware of; pre-clinical and
clinical trials may be more costly or take longer to complete than anticipated
and may not generate results that warrant future development of the tested
drug candidate; the FDA may determine that the design and planned analysis of
Tekmira's clinical trials do not adequately address the trial objectives in
support of Tekmira's regulatory submissions; the FDA may not approve the
commencement of Tekmira's planned clinical trials or approve the use of
Tekmira's products; Tekmira may not initiate a new TKM-Ebola Phase I clinical
trial in the anticipated timeframe, or at all; Tekmira's development partners
and licensees conducting clinical trial, development programs and joint
venture strategic alliances may not result in expected results on a timely
basis, or at all; a Phase III or pivotal trial for ALN-TTR02 may not start as
currently anticipated, or at all; expected milestone or royalty payments from
Alnylam may not be received in the quantum and on the timing currently
anticipated, or at all; future operating results are uncertain and likely to
fluctuate; Tekmira may not be able to raise additional financing required to
fund further research and development, clinical studies, and obtain regulatory
approvals, on commercially acceptable terms or at all; economic and capital
market conditions; Tekmira may become subject to product liability or other
legal claims for which Tekmira has made no accrual in its financial
statements; and the possibility that Tekmira may not have sufficiently
budgeted for expenditures necessary to carry out planned activities.

A more complete discussion of the risks and uncertainties facing Tekmira
appears in Tekmira's annual report on Form 20-F for the year ended December
31, 2012 (Annual Report), which is available at www.sedar.com or at
www.sec.gov/edgar.shtml. 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: Investors
         Jodi Regts
         Director, Investor Relations
         Phone: 604-419-3234
         Email: jregts@tekmirapharm.com
        
         Media
         David Ryan
         Longview Communications Inc.
         Phone: 416-649-8007
         Email: dryan@longviewcomms.ca

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