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4/21/2011 1:08:04 PM
Tekmira and the National Cancer Institute Publish Promising Data Demonstrating the Anti-Tumor Activity of a Novel Cancer Target

Tekmira Pharmaceuticals Corporation, a leading developer of RNA interference (RNAi) therapeutics, announced today that promising preclinical data from its collaboration with the National Cancer Institute (NCI) has been published in Oncogene, one of the world's leading cancer journals.

The article is entitled "Molecular targeting of CSN5 in human hepatocellular carcinoma: a mechanism of therapeutic response" and presents encouraging pre-clinical data related to the treatment of liver cancer using small interfering RNA (siRNA) enabled by Tekmira's lipid nanoparticle (LNP) delivery technology.

"We are pleased to see further exciting CSN5 anti-tumor data coming out of our ongoing collaboration with the National Cancer Institute. We believe that the NCI's expertise in identifying novel cancer targets is complemented by Tekmira's expertise in siRNA molecule design and LNP delivery," said Dr. Mark J. Murray, Tekmira's President and CEO.

Scientists at the NCI have worked in collaboration with Tekmira to develop siRNA to silence the CSN5 gene, which could represent a novel therapeutic target to treat hepatocellular carcinoma (HCC) and other cancers. This latest data indicates that siRNA-mediated CSN5 knock-down inhibits cell-cycle progression and greatly increases the rate of apoptosis (programmed cell death) in HCC cells. Some key highlights from the article include:

Gene expression data indicating that CSN5 has a pivotal role in HCC pathogenesis and microarray analysis revealing CSN5 may be one of the early markers of malignant conversion of HCC. Optimized siRNA against CSN5 resulted in 80% inhibition of tumor cell growth in vitro. Systemic delivery of the siRNA using Tekmira's LNP delivery technology resulted in a significant reduction in tumor growth in a model of human liver cancer.

"We look forward to continuing our collaborative work with the NCI to identify novel cancer targets and demonstrate anti-tumor activity by silencing these genes through RNA interference with the goal of advancing new oncology product candidates," added Dr. Murray.

CSN5 over-expression has been observed in a number of cancers, including breast, thyroid, skin, ovarian, lung and pancreatic cancers. HCC is the third most lethal cancer, causing an estimated 600,000 deaths annually due in part to a lack of effective treatment options.

Tekmira continues to advance its pipeline of proprietary product candidates, including Tekmira's lead oncology product, TKM-PLK1, which is currently in a Phase 1 human clinical trial conducted at three medical centers in the United States.

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.

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 http://www.tekmirapharm.com. Tekmira is based in Vancouver, B.C.

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