Mark Murray
Analyst · RBC Capital Markets
Good afternoon, everyone. And thank you for joining us today. We've made meaningful strides this quarter and remain on track for all of our corporate milestones. Today, I will highlight some recent developments. I would like to talk first about our antiviral product platform, which includes RNAi therapeutics addressing chronic hepatitis B infection and lethal hemorrhagic fever viruses such as Ebola and Marburg. In our most compelling program, HBV, we are currently finalizing the constituents of the RNAi trigger cocktail, which will comprise TKM-HBV, and is designed to eliminate surface antigen production in chronically infected HBV patients. This is the significant unmet need in the many thousands of patients treated with small molecule nucleotide therapy.
The RNAi trigger cocktail and its constituents are undergoing a comprehensive preclinical evaluation in support of the regulatory filings planned for the second half of this year in order to launch clinical trials in early 2015. We will employ third-generation LNP technology, the most potent thus far in this product.
As part of our product development and planning process, we have assembled a scientific and clinical advisory group of the world's leading HBV experts to gain from their insights and expertise. Our HBV advisory board will support the development of TKM-HBV by providing input into our preclinical studies and the data package, clinical development plans and the identification of productive clinical trial sites.
The HBV program will benefit from the strategic input and expertise offered by this accomplished group of physician scientists.
We are complementing this expertise by continuing to expand our internal clinical development capability with the establishment of a U.S.-based clinical development organization. Our drug development knowledge, coupled with LNP, the most clinically validated RNAi delivery technology, ensures that Tekmira is well positioned to develop the most effective RNAi therapeutic product in the Hepatitis B field.
This conclusion is further supported by data presented this week from Sirna/Merck in their LNP-enabled HBV program. This involved an early generation LNP delivering a single siRNA. Among the data presented from the multi-dose study, that carried out in a chronically infected chimpanzees. They demonstrated a dose-dependent reduction in both viral DNA and Hepatitis B surface antigen.
Up to a 2.3 log reduction in HBV surface antigen was observed at a dose of 0.5 mg per kg, and this surface antigen reduction was durable, supporting a clinical dosing frequency of once per month. We anticipate our HBV program, which will use newer generations of LNP and newly designed RNAi trigger cocktail, will exceed these results.
Our Hepatitis B program is underpinned by our many years of experience developing antiviral RNAi therapeutics. For example, our anti-Ebola viral therapeutic is being developed under a $140 million contract with the U.S. Department of Defense. This past quarter, we commenced a Phase I clinical trial evaluating the safety of TKM-Ebola therapeutic in healthy adult subjects. Based on the seriousness of Ebola virus infection and a clear unmet need, the FDA recently granted Fast Track designation to our TKM-Ebola program.
The current outbreak in West Africa underscores the importance of developing an effective therapeutic to treat Ebola virus infection. Because our TKM-Ebola therapeutic is not yet approved for human use, there is presently no appropriate regulatory framework to support the use of this product in the current outbreak. However, we continue to make strong progress in our TKM-Ebola clinical program therapeutic, which is also enabled by third-generation LNP.
Dr. Ian MacLachlan will present interim data on the Phase I clinical study at the 17th Annual Meeting of the American Society of Gene & Cell Therapy in Washington, D.C., May 21 to 24. We expect completion of the Phase I clinical study in the second half of this year.
We expect our considerable antiviral expertise with TKM-Ebola and Marburg will translate to a highly potent and effective antiviral therapy for HBV.
Now I'll shift our focus to our oncology studies with TKM-PLK, our RNAi therapeutic targeting the PLK1 enzyme implicated in a variety of tumors.
We are currently conducting Phase IIa clinical trials in 2 indications: GI-NET, or gastrointestinal neuroendocrine tumors; and ACC, or Adrenocortical Carcinoma. In these Phase IIa studies, we plan to treat approximately 20 GI-NET or ACC patients with a minimum of 10 GI-NET treated. Our objective is to confirm and expand the clinical benefit observed in patients with these diseases in the Phase I study. Currently, we have 8 clinical trial sites open and enrolling patients, including the leading sites in the United States for GI-NET and ACC patient treatment. We're very pleased that the enrollment rates in this study are on track. We plan to present the available GI-NET study results later this fall.
Today, we'll provide a brief update on the ACC data available. Thus far, we have enabled to assess response in 4 ACC patients. Three of these 4 have demonstrated a clinical benefit, including 1 resists qualifying partial response. This patient with a partial response has been on TKM-PLK for 12 months and has experienced a 42% reduction in their target tumor mass, which is located outside of the liver. Furthermore, this lesion is showing evidence of necrosis indicative of antitumor activity.
We also remain on track to initiate a Phase I/II clinical trial with TKM-PLK1 in the first half of this year in patients with Hepatocellular Carcinoma, or HCC, at multiple international trial sites.
Now looking to our early-stage preclinical work, we remain on track to nominate another product candidate for clinical development this year. To support our decision, we are generating meaningful preclinical data in a variety of programs, including our work in rare and orphan disease indications.
On the partnering front, we continue to seek partnerships, where we can best leverage our LNP technology to enable the programs of our collaborators, while providing nondilutive capital to support Tekmira's own development programs. Our portfolio of revenue-generating partnerships continues to expand, and I'm pleased with our progress.
Earlier this year, we partnered with Monsanto, who is seeking a delivery solution to enable RNAi products in the agricultural field. Monsanto will use our technology to develop new options for sustainable pest and weed control. Our agreement spans 4 years and has a potential value of up to $86. [ph] million, following the successful completion of milestones. Already, we've received a near-term payment of net $14.5 million.
We're also pleased to report today progress made by Tekmira partners in the past quarter. Recognized as the gold standard in the field, our LNP delivery technology continues to drive the most significant RNAi advances and enables multiple RNAi products in clinical development in a variety of therapeutic areas. In late April, Alnylam released new data from its Phase II trial with LNP-enabled patisiran, or ALN-TTR02, which further validated Tekmira's proprietary LNP technology. Alnylam presented positive initial data from a Phase II, open-label extension study, which demonstrated sustained clinical activity with TTR knockdown at the 80% target level and tolerability with extended dosing. We are pleased with the progress supported by Alnylam, and this program is enabled by Tekmira's LNP technology.
And finally, this past March, we successfully completed a public offering, providing us with gross proceeds of over $60 million, fortifying our cash balance to $134 million. This strong response to the offering not only validates the exceptional science that takes place at Tekmira, it also further fortifies our balance sheet and broadens our reach with U.S.-based institutional investors.
I'll pause here and turn things over to Bruce, who will provide some further detail on key financial milestones and achievements.