Howard Robin
Analyst · Brean Murray
Thank you, Jennifer and thanks to everyone for joining us this afternoon. Today, I will spend the first part of the call discussing the royalty transaction that we announced today and our convertible debt. Then I will update you on the significant progress we've made with both our partnered programs and our proprietary pipeline. Following that, John will provide 2012 financial guidance.
This morning we announced the sale of Nektar's royalties on CIMZIA and MIRCERA for $124 million. The proceeds from this transaction will go towards the repayment of more than half of our $215 million in convertible debt. For your reference, in 2011 we recognized $8.3 million of royalties from CIMZIA and MIRCERA. I strongly believe that these royalty streams were not adequately reflected in our valuation and their monetization represented a very attractive non-dilutive financing.
We have a number of options to deal with the remaining $91 million in convertible debt. Of course, I prefer non-dilutive options if the terms are right. As I've said before, we will continue to pursue options that are in the best interest of our shareholders.
Now, before I go into discussing our pipeline programs, I'd like to give you an update on the timing of cash milestones for our most important and advanced program, NKTR-118, which recently received its INN name naloxegol. Naloxegol is advancing through Phase III development and AstraZeneca plans to file in both the U.S. and the EU in the middle of 2013.
Now, let me tell you what that means for Nektar. Upon acceptance of these filings in 2013, Nektar is entitled to $95 million of our $235 million in filing and launch milestones. The remaining $140 million is due when naloxegol is approved and launched in the U.S. and EU.
We are excited about the scope of AstraZeneca's global and comprehensive Phase III program for naloxegol. The KODIAC Phase III program has 2 pivotal 630-patient efficacy studies in non-cancer pain patients. In addition, KODIAC also has a 52-week open-label safety study in non-cancer pain patients and a 340-patient efficacy study in cancer pain patients.
As I mentioned at JPMorgan, the 52-week safety study for naloxegol completed enrollment in November of 2011 and patients are continuing on treatment to complete the one-year safety data day. As we said earlier, the studies are on track to file naloxegol in the U.S. and EU in the middle of 2013.
Opioid-induced constipation is an important medical problem, addressing a potentially very large market. There are over 250 million prescriptions for opioids written annually in the U.S. alone and constipation becomes a clinical issue in about 50% of patients.
And when we look at who writes the prescriptions for opioids, half are written by primary care physicians. A significant portion of opioid prescriptions are also written by pain specialists and other specialists, treating the underlying conditions contributing to pain. Very few of these prescriptions are written by GI specialists; in fact, under 1%.
The physicians who prescribe opioids are the same physicians who will ultimately manage OIC for patients and write the prescriptions for an OIC drug. And this is precisely why we chose to partner naloxegol with AstraZeneca. AZ has a global sales team that covers the full spectrum of opioid prescribers, including primary care physicians and specialists in pain and cancer. We can't think of a better company to market naloxegol and we are highly confident in AstraZeneca's ability to define and lead the OIC market.
In addition to the $235 million in filing and launch milestones I mentioned earlier, Nektar is entitled to significant escalating double-digit royalties on product sales of naloxegol and up to $375 million in additional sales milestones at certain commercial sales levels on top of those royalties. As a reminder, AstraZeneca is responsible for all costs of development and commercialization of the product.
Naloxegol is a great example of the power of Nektar's research platform and the type of innovative drug candidates we are bringing forward into clinical testing. There are very few companies of Nektar's size of a proven technology platform capable of rapidly generating such a large and diverse pipeline.
One of the most exciting things about Nektar that I believe is underappreciated is that by the end of this year, Nektar could have 4 different programs in Phase III across 4 different therapeutic areas; naloxegol with AstraZeneca, NKTR-102 in metastatic breast cancer which is already in Phase III, and NKTR-061 in pneumonia with Bayer, and BAX 855 in hemophilia with Baxter, both of which are planned to enter Phase III this year.
Further, the clinical and commercialization costs of 3 of these programs are being funded by our strategic pharmaceutical partners. All of these programs represent significant economic potential for Nektar.
Now, let's talk about NKTR-102, our next-generation topoisomerase I inhibitor being developed in multiple tumor settings. As you'll recall, the Phase II data for NKTR-102 in both ovarian and breast cancer demonstrated highly encouraging results in very poor prognosis population, which include patients who are heavily pretreated, highly chemoresistant or had particularly aggressive forms of cancer.
In December, we dosed our first patients in the Phase III BEACON registration study for NKTR-102 in women with metastatic breast cancer. BEACON, which is an open-label, randomized, head-to-head trial, will enroll approximately 840 patients comparing single-agent NKTR-102 to an agent of physician's choice with the primary endpoint of overall survival.
The FDA and the EMA have agreed with our proposed study design, our primary endpoint of overall survival, and our comparator arm. Enrollment is well underway now with more than 60 investigator sites initiated in the United States. We plan to initiate a total of approximately 150 sites in the U.S. and Europe, as well as some Asia-Pacific countries.
We currently estimate that enrollments of patients in the BEACON study will be complete by the end of 2013 and that the study could be complete by the end of 2014. The BEACON study builds on NKTR-102's excellent Phase II clinical results in metastatic breast cancer.
NKTR-102 performed very well across all subsets in our Phase II study in patients with very advanced disease with a 30% response rate, including 6 patients with complete resolution of target lesions. This high response rate was consistent in all subsets, patients with prior AT treatment, prior ATC treatment, HER2-positive, HER2-negative disease, as well as triple-negative disease, demonstrating that NKTR-102 is highly active in metastatic breast cancer.
As the first and only topoisomerase I inhibitor being developed in breast cancer, NKTR-102 also offers a different mechanism of action than commonly used agents such as eribulin and taxane, which are which are microtubular inhibitors and exhibit cross-resistance with each other. There is no clear standard of care for patients with metastatic breast cancer who have progressed after ATC treatment. In addition, there are no late-stage studies ongoing in this patient population. If we are successful, NKTR-102 has the opportunity to become a worldwide standard of care in advanced breast cancer.
Moving on to NKTR-102 in platinum-resistant ovarian cancer. As we said last quarter, enrollments in our expanded Phase II study was limited because of the Doxil shortage and as a result, we are now closing enrollment and we've begun collecting data on the patients in this study. Through February, we had enrolled a total of 94 patients in the Phase II expansion study.
We plan to share our top-line response rate data from the trial with you at our upcoming R&D Day in New York at April 16th. And as we said before, following the review and analysis of these data, we plan to meet with the FDA to discuss NKTR-102 and explore our regulatory options and development strategy in ovarian cancer.
Next, I'd like to talk about NKTR-061 or Amikacin Inhale, partnered with Bayer. Amikacin Inhale could potentially be the first product to treat serious ICU lung infections by delivering antibiotics directly into the lung. We continue to conduct our final tests on the commercial drug-device combination to prepare for Phase III study.
Bayer plans to start Phase III in the second half of 2012. The pivotal design for the Phase III program was agreed upon through an SPA from the FDA. These studies will enroll approximately 1,200 patients with the primary endpoint of clinical test of cure. NKTR-061 has significant economic potential for Nektar, with a flat 30% royalty in the U.S. and an average ex-U.S. royalty of approximately 20%. Both Bayer and Nektar continue to be very committed to moving Amikacin Inhale as quickly as possible into Phase III.
Another significant program for Nektar is BAX 855. BAX 855 is a long-acting ADVATE that uses Nektar-patented PEGylation technology. BAX 855 is in Phase I in hemophilia patients with our partner, Baxter. This study is expected to be completed around the middle of this year and if the Phase I study is successful, Baxter plans to initiate the Phase III program with BAX 855 before the end of 2012.
Baxter's ADVATE is the world-leading Factor VIII therapy for hemophilia patients and has sales of over $2 billion annually. Analysts following the Factor VIII estimate a market potential of between $3 billion and $4 billion for long-acting Factor VIII products. As a result, the economic potential of BAX 855 could be very significant for Nektar.
Now, I'd like to talk about 2 exciting proprietary drug candidates that Nektar is developing for pain, NKTR-181 for chronic pain and NKTR-192 for acute pain. Both molecules leverage our expertise in modulating drug entry into the brain. It is important to note that these are not formulations and not prodrugs. These are new opioid molecules and each program represents a sizable market opportunity for Nektar.
NKTR-181 represents a significant potential advance in opioid pain relief. Again, NKTR-181 does not require a formulation to achieve its clinical profile. Its compelling properties are inherent to its chemical structure. As a result, based on our research, crushing, melting or otherwise manipulating NKTR-181 won't change its attributes.
NKTR-181 was specifically designed to be long-acting and to enter the CNS slowly, avoiding the rapid rush of traditional opioid compounds, which leads to euphoria and ultimately to higher levels of abuse. In addition, this slow rate of entry into the brain should also reduce other CNS-mediated side effects which are seen with other traditional opioids such as sedation and respiratory depression.
This past weekend we presented new clinical data from our multiple ascending dose study of NKTR-181 at the American Academy of Pain Management meeting. The double-blind, randomized, placebo-controlled study evaluated multiple doses of NKTR-181 administered twice daily in healthy subjects.
Data from this study confirmed that NKTR-181 enters the brain slowly. Using pupil constriction as a measure of the onset of central opioid effect, we've demonstrated that NKTR-181 enters the CNS at a rate approximately 10 times slower than oxycodone. The centrally-mediated opioid effects of NKTR-181 extend over an entire 12-hour dosing period.
NKTR-181 is intended to treat chronic pain and we have now demonstrated analgesic response in 2 different models of pain in healthy volunteers. In a cold-pressor test model of centrally mediated analgesia, NKTR-181 given twice-daily over the 8-day dosing period demonstrated a significant analgesic effect as compared to placebo. In another pain model, a model of ultraviolet burn injury, NKTR-181 produced significant analgesic and anti-hyper analgesic responses indicating that NKTR-181 has both centrally mediated and peripherally mediated analgesic effect.
And importantly, NKTR-181 was well tolerated at all doses in the study. There were no adverse events related to respiratory depression observed at any dose tested. The most common adverse events were mild in nature and included constipation, nausea and dizziness. Of the 48 subjects who receive study drug twice-daily over 8 days of dosing, there was only 1 report of mildly elevated mood.
We are tremendously excited about the proof of concept from our Phase I program for NKTR-181. If this program is successful, NKTR-181 will dramatically change the landscape for the treatment of chronic pain. In the U.S. alone, there are over $5 billion of annual sales of long-acting opioids to treat chronic pain.
We are currently preparing for the Phase II study of NKTR-181, which is scheduled to start in the middle of this year. The Phase II program will include a total of up to 300 patients in 2 studies. The first study will be a randomized, double-blind, placebo-controlled study in chronic pain patients and we expect data from this study in the first half of 2013. The second study will be a human abuse liability study comparing the likeability of NKTR-181 to a currently marketed opioid.
Now, I'd like to talk about our next important program in pain, NKTR-192, which is also a new mu-opioid analgesic molecule, designed to have a reduced rate of entry into the CNS. NKTR-192 targets acute pain with a molecule specifically designed to have a short-acting profile and a relatively fast onset of action. With NKTR-192, we've demonstrated rapid onset of analgesia and observed reduced sedation, reduced abuse liability, and less respiratory depression as compared to standard opioids in our preclinical model.
These compelling preclinical findings for NKTR-192 were highlighted at a press conference at the 2011 Society for Neuroscience meeting last November. The results were also covered in a January editorial in the Journal of the American Medical Association. NKTR-192 could be a highly differentiated drug to treat acute pain, which is a $3 billion market in the U.S. alone. We plan to initiate a Phase I study of NKTR-192 this quarter and we should have results from this Phase I study by the middle of this year.
With both NKTR-181 and NKTR-192 in our portfolio, Nektar is now positioned to target both chronic and acute pain market. These new opioid molecules could be game-changing in the area of pain relief and we are tremendously excited about their advancement and development.
Before I hand the call to John, I want to personally invite you to our R&D Day, which will be on April 16th at the Palace Hotel in New York. We are privileged to have a number of key thought leaders in pain and oncology attending, and we look forward to sharing more detail on our programs and the potential of our technology platform. We also look forward to seeing many of you at both the Cowen and Barclays conferences in March.
With that, I'll now turn the call over to John.