Daniel Passeri
Analyst · Simos Simeonidis from Cowen and Company
Okay. Thanks, Mike. Good morning, everyone, and thanks for joining us today. 2011 was a highly important and critical year for us, one in which our execution in clinical development progress set the stage for important milestones and corporate development growth of 2012. Already, of course, the beginning of 2012 has been transformative following the recent FDA approval of our collaborative Genentech's NDA submission of Erivedge, as the first and only FDA approved medicine for patients with advanced BCC, which is a type of basal cell carcinoma that has spread to other parts of the body or that has come back after surgery or healthcare provider decides cannot be treated with surgery or radiation. This is Curis' first drug approval and Erivedge is also the first in class Hedgehog inhibitor to reach commercialization.
As such, it's truly a landmark event for Curis and our shareholders, we look forward to further value-creating advances through 2012 and look forward to providing you with ongoing updates. Erivedge is being developed and will be commercialized by our partner, Genentech and Roche, under our collaboration agreement.
At this time, I'd like to remind everyone that although this approval represents a watermark event for Curis and its shareholders, the Erivedge approval is more importantly a breakthrough for patients suffering from advanced BCC. And just to give you a context, BCC is the most common form of cancer in the United States and the most common type of skin cancer accounting for approximately 2 million new cases annually. While the disease is generally considered curable when restricted to a small area of the skin, a small percentage of this population may have the cancer advance further into the skin, bones or other tissue or spread to other parts of the body. In these cases, the disease is difficult to treat and often life threatening. Erivedge is now the only approved treatment for this advanced form of the disease.
Prior to Erivedge's approval, there was no approved therapy for this disease. Advanced BCC often results in severe deformity or impaired function of the affected organs, and patients, historically, have typically received one or more interventions including surgery, radiation and various chemotherapies, none of which are effective therapies for advanced BCC. So the FDA approval of Erivedge is based on results from the ERIVANCE BCC trial, which was a pivotal international single-arm multicenter, 2-cohort, open-label, Phase II study that enrolled 104 patients with advanced BCC. This included 71 patients with locally advanced BCC and 33 patients with metastatic BCC.
Patients with locally advanced BCC had lesions that recurred after surgery, or were not candidates for surgery because the lesions were considered inoperable or for whom surgery would result in substantial deformity or the lesions had recurred after radiotherapy, or were not candidates for radiotherapy. Study participants received 150 milligrams of Erivedge orally, once daily, until disease progression or unacceptable toxicities. The primary endpoint of the study was objective response rate as assessed by an independent review. The study showed Erivedge shrank lesions in 43% of patients with locally advanced BCC and 30% of patients with metastatic BCC. The median duration of response was 7.6 months and the median duration of treatment was just over 10 months. The most common adverse events observed in the study, which include those observed in greater than 20% of patients, included muscle spasms, hair loss, altered taste sensation, some weight loss, fatigue, nausea, decreased appetite and diarrhea. 4 patients, which was approximately 4%, had serious adverse events that will continue to be possibly related to Erivedge.
Fatal events were reported in 7 -- 7% or 7 patients, one -- none of which were considered by the investigators to be related to Erivedge. In all these fatalities, pre-existing risk factors and co-morbid conditions were present. In addition to offering an important new treatment for patients, we believe that this approval has important immediate and potential long-term financial implications for Curis and its shareholders. Following the approval, Curis has earned a $10 million milestone payment from Genentech, and we expect Erivedge to provide Curis with potentially significant future revenues from our royalties on Genentech's net sales of Erivedge in the U.S. market with sales beginning eminently at a price of $7,500 per month per patient.
Genentech and Roche are working to closely identify the exact patient population as they begin to launch this new drug. Importantly, though, Roche recently communicated that they estimate the market for advanced BCC in the U.S. alone to be approximately 14,000 patients. It's important to note, this number is an estimate, as there is no published epidemiological data on advanced BCC. In addition, we would receive potential additional milestone payments and royalties for development and regulatory approvals of Erivedge in advanced BCC in territories outside the U.S. market.
For example, Erivedge is currently under review by the European Medicines Agency, the EMA, which if approved, will result in patient access within Europe. Roche has indicated that it currently anticipates possible approval by the EMA in either late 2012 or early 2013. Genentech is also currently conducting a Phase II clinical trial of Erivedge in patients with operable nodular basal cell carcinoma, which is a less severe form of the disease and accounts for a significant percentage of the approximately 2 million BCC's diagnosed annually in the United States. The study was initiated by Genentech in October 2010 to test Erivedge as a single agent therapy in approximately 50 patients with operable nodular BCC and a U.S.-based open-label, 2-cohort clinical trial. All patients received 150 milligrams daily oral dose of Erivedge for 12 weeks. The primary outcome measure for the first cohort is the rate of complete histological clearance of target nodular BCC lesions at the time of tumor excision, which may occur up to 12 weeks following initiation of treatment.
While the primary outcome measure for the second cohort is the rate of durable complete clearance of target nodular BCC lesions at the time of excision, which may occur up to 36 weeks following treatment, initiation of treatment. Genentech has completed enrollment and data evaluation for patients treated in the first cohort of the study and has submitted data for this cohort for presentation at a medical conference during the first half of 2012. Genentech has informed Curis that further study and analysis of Erivedge inoperable BCC is required to determine a potential future development plan including completing ongoing patient enrollment and treatment in the second cohort, and we currently anticipate that the study will be completed during early 2013. We look forward to giving you updates as they become available.
In addition to the operable BCC study being conducted by Genentech, multiple trials in other cancer types are ongoing by third-party investigators, including exploring Erivedge in basal cell nevus syndrome, which is also called Gorlin Syndrome, medulloblastoma, which is a pediatric brain cancer. It's approximately 30% to 40% have a Hedgehog involvement. Sarcoma, glioblastoma multiforme, as well as in pancreatic small cell lung, gastroesophageal junction, gastric, breast, prostate cancers, among others. We expect that some of these studies should yield data during 2012, and we look forward to providing additional updates on the Erivedge program as data becomes available on an ongoing basis.
Not only does the Erivedge approval have significant financial implications for Curis but we believe that it also demonstrates the real potential of our pipeline of innovative, multi-targeted small molecule inhibitors, all of which are designed to achieve a more durable suppression of cancer networks with the potential to address the resistance that often develops with most targeted therapies. Curis was a pioneer in the basic discovery research around the Hedgehog pathway and we began our collaboration with Genentech in 2003 to continue research and development around the discovery and development of cancer therapeutics that are designed to inhibit this important pathway. Our scientists were actively involved in the preclinical research and development of Erivedge until its clinical testing began, at which point Genentech and Roche drove further development of this molecule. Our relationship with Genentech has been extremely important to Curis and our experience working with a world-class research and development organization has truly helped us develop highly capable core competencies and to shape Curis' strategic focus on internal discovery and development of next-generation targeted small molecule drug candidates for treating cancer.
As a result of this strategic focus, Curis has discovered a number of highly promising drug candidates, including CUDC-101, which is our first-in-class proprietary potent and selective multi-target EGFR, Her2 and HDAC inhibitor, which we are developing and control ourselves as a key assets of company and I'd like to underscore that it's exemplary of our multi-target cancer network disruption approach. Also, Debio 0932, which is an orally available, wholly synthetic, non-geldanamycin Hsp90 inhibitor, licensed to Debiopharm, CUDC-907 is also a multi-class, multi-target inhibitor which is a first-in-class orally available small molecule, dual inhibitor of PI3 kinase and HDAC that we're advancing towards an anticipated IND filing later this year and I'll provide further updates on these programs momentarily.
As we look ahead for the rest of 2012, the Erivedge approval is just a first of what we expect will be many key milestones for each of our 4 programs, which I'll outline for you now in more detail beginning with proprietary program CUDC-101. I'll now provide an update on 101 in terms of its clinical progress and also the development of a potential oral form. 101 is our lead proprietary drug candidate from our cancer-targeted network disruption programs. We believe that CUDC-101 is exemplary of our overall approach to designing novel drug candidates in which we aim to enhance the therapeutic effect and durability of clinical response by designing molecules that attack cancer cells at multiple complementary and potentially synergistic points of intervention. We refer to this approach as cancer network disruption. Very good, everyone is familiar with the limitations of single-targeted agents, to which the cancer typically adapts resistance to work around a single point of blockade. So our approach is to disrupt more than one point and the objectives of disrupting the networks that the cancer has access to.
During the fourth quarter, we completed enrollment of the first cohort in our ongoing Phase I clinical trial of CUDC-101 and patients with human papillomavirus or HPV negative, locally advanced head and neck cancer, in combination with radiation in cisplatin. Just to remind everyone, HPV positive head and neck cancer is about 1/3 of the total number. The total number is about 45,000 patients annually, so there's about 30,000 patients that are HPV negative. The practical implications of that are that the virus is not driving the cancer and radiation in cisplatin have proven very effective against the virally -- the virus-driven cancer. We're focusing on the non-HPV EGFR and Her2 driven cancer. So the primary objective of this study is to evaluate the safety and tolerability of CUDC-101 when administered in combination with the current standard of care, which is radiation in intermittent cisplatin, which is a chemotherapeutic drug.
Patients in the first cohort show no obvious toxicities beyond those related to the concomitant dosing that are generally observed with radiation and intermittent cisplatin. And appear to be benefiting from the drug combination, albeit it's still too early for conclusive statements. We are, however, highly encouraged by the early data as in these patients that we're observing and we look forward to providing you with further details as more detailed data emerges. Assuming that the last 2 patients remain on the study, without the occurrence of a dose-limiting toxicity, we anticipate that we can begin treating the first patient in the second cohort of this study later this month.
We're currently recruiting patients at 4 study centers in the U.S. and plan to expand enrollment to additional sites. Importantly, our initial dose of CUDC-101 began at 225 milligrams per meter squared in this study and we're hopeful that we will only need to dose escalate one time, as we plan to dose the next cohort at our Phase Ia maximum tolerated dose of 275 milligrams per meter squared. I'll remind everyone that the starting dose of 225 is within the range that we believe is a therapeutic window where in earlier studies, we did see response at 150 milligrams. So we feel confident that we're within the therapeutic window starting at 225 and are optimistic that we'll be able to achieve the MPD in combination.
Barring any occurrence of dose-limiting toxicity, in any of the patients treated at 275 milligrams per meter squared, our goal is to complete the dose escalation portion of this study in mid-2012 and then to treat up to 10 additional patients at that dose. Assuming the successful outcome of the study, we plan to progress CUDC-101 into a randomized Phase II study comparing the safety and efficacy of radiation and intermittent cisplatin therapy plus or minus CUDC-101 to begin in 2013.
We view the head/neck cancer indication to be an ideal initial -- a commercial path indication with our current IV formulation of CUDC-101, as the drug targets the primary driving mechanisms of HPV negative head and neck cancers. It's also been synergy reported with the use of HDAC inhibitors with radiation and our scientists have demonstrated with preclinical data that CUDC-101 appears to synergize with intermittent cisplatin. Also, the IV-dosing schedule aligns well with the current standard of care where patients must present to the clinic every weekday for 7 straight weeks to receive radiation. So we're also continuing to progress, as I stated earlier, a possible oral formulation of CUDC-101 and currently expect that we'll file an IND during 2012.
We're confident by the data that we have generated to date and optimistic that we'll be successful with this objective. Importantly, the oral formulation would allow us to expand potential clinical indications and take advantage of what we've observed and learned from the Phase I expansion cohort with the IV formulation. We're currently in the process of finalizing data and study close out of our Phase I expansion study with CUDC-101, and we anticipate that we'll present observations of the full data from this study at a medical conference during 2012.
I'd now like to turn to CUDC-907 -- excuse me, which is an orally available synthetic small molecule dual inhibitor of PI3 kinase and HDAC. We believe that we received important external validation for this molecule during the fourth quarter of 2011 when we entered into an agreement, under which The Leukemia & Lymphoma Society, or the LLS, will support our ongoing development of CUDC-907 for patients with B-cell lymphoma and multiple myeloma.
I'd like to just briefly touch upon, mechanistically, the advantages we believe 907 has. First, it's orally available. And we've demonstrated preclinically that it is potently and selectively blocking PI3 kinase phosphorylation and importantly, the HDAC component appears to block the compensatory bypass mechanism of MEK. And if you look at the clinical trials ongoing with large pharma companies that have PI3 kinase inhibitors, most of them have had to go back into Phase I studies combining it with a MEK inhibitor because that's the resistance pathway that's up regulated, and we believe the real advantage of the 907 is that it concurrently blocks 907 and prevents this resistant mechanism from being acceptable.
So the agreement with, as part of the LLS therapy acceleration program, was a strategic initiative to speed up the development of therapies that have a potential to change standard of care for patients with hematological cancers, especially in areas of high met -- high-unmet medical need. And under the agreement, LLS will fund approximately 50% of the direct cause of the development of CUDC-907, which is up to $4 million. We're currently conducting preclinical studies of CUDC-907, and we have a solid body of data demonstrating, mechanistically, that 907 should have therapeutic effect on lymphoma, because we've seen that's the principal target mechanism of 907 where we're seeing really impressive targeting of lymphocytes.
We expect to file an IND and then we'll start patient enrollment in a Phase Ia dose escalation clinical trial in the second half of 2012 in patients with B cell lymphoma and multiple myeloma. Again, underscoring the specific mechanism that we've observed preclinically in the study. If it's successful, LLS has agreed to support our subsequent Phase 1b or Phase IIa study in one or more specific indications, as well as our ongoing investigation of biomarkers for CUDC-907 in these diseases. We're very pleased with the opportunity to collaborate with LLS on the development of CUDC-907, and we are presently completing the required IND enabling studies for the CUDC-907, which again is an oral form, and we're also working on the final formulation of this drug candidate.
Assuming favorable outcomes of these ongoing efforts, we plan to file an IND application for this compound in the third quarter of 2012. We look forward to providing further updates on CUDC-907 as this molecule advances towards the IND filing and Phase I initiation.
I'll now turn to our Hsp90 program which is being developed by our licensee, Debiopharm. The lead candidate under this agreement is designated Debio 0932, which is a synthetic, non-geldanamycin, orally available small molecule Hsp90 inhibitor. In April 2010, Debiopharm treated the first patient in the Phase I clinical trial to evaluate the safety of Debio 0932 in patients suffering from advanced solid tumors. In 2011, Debio 0932 successfully advanced to the dose escalation portion of the Phase I study and the clinical results observed include single-agent responses in certain cancers and what appears to be a highly favorable safety profile.
Debio has indicated that it expects to present results of this Phase I study at a medical conference during the first half of 2012. And just to remind everyone, the fact that we appear to have a highly favorable safety profile is already a differentiating competitive factor in positioning the drug where a number of Hsp90 inhibitors have demonstrated toxicities that have prevented their progressing further. So we're very pleased with the data generated to date. Debio is screening patients to initiate a Phase Ib study of Debio 0932 and we expect that a Phase I/II study of Debio 0932 in small cell lung cancer patients will be initiated in the second quarter of this year. The objective of this Phase 1b study and expansion cohort of certain solid tumor patients will be to further assess the safety profile, pharmacokinetics and pharmacodynamics of Debio 0932 at a potential Phase II dose level and to make a preliminary assessment of antitumor activity in patients with advanced solid tumors. We will be eligible for our next milestone under this agreement if and when Debio treats its fifth patient in a Phase II clinical trial, assuming that Debio advances, Debio 0932 into Phase II clinical testing. We currently anticipate that Phase II testing could initiate in the first half of 2013.
Before turning the call back to Mike to review our fourth quarter and year-end 2011 financial results, I'd also like to note that the Head of Research, Chang Qian, will be departing Curis in the near future to pursue other opportunities, including the prospect of establishing a company in China to conduct preclinical and clinical development for the China market. Chang has been a valued colleague at Curis, has been instrumental in leading our research group that discovered CUDC-101, Debio 0932 as well as 907, since we began focusing several years ago on the discovery and further development of targeted small molecules for cancer indications. I'd like to personally acknowledge and thank Chang for his important contributions and wish him continued success in his future endeavors. Although Curis intends to continue to further develop selected discovery stage programs, our principal focus moving forward will be directed to continuing to enhance our capabilities and capacities for clinical development for our next-generation targeted cancer therapies including our proprietary asset CUDC-101 and 907.
We've been transitioning our internal research team over the past year to focus upon translational research studies in support of our ongoing clinical studies of CUDC-101 and we expect that this will continue in the future for both CUDC-101 and 907. Going forward, all discovery and translational research activities will be conducted under Dr. Maurizio Voi, who has recently joined Curis as our Chief Medical and Development Officer and joined Curis in November of last year from Pfizer.
As such, we currently have no plans to -- or we believe requirements to fill Chang's position. Again, I'd like to thank Chang for his contributions to Curis over the past several years and we certainly wish him success in his future endeavors.
I'd like to now turn the call over to Mike for financial discussions and the following Mike's remarks, we'll open the call up for questions. Thank you.