Daniel Passeri
Analyst · Cowen and Company
Yes. Thanks, Mike. Good morning, everyone, and thank you for joining us today. We've seen continued pipeline progress in the beginning of 2012 with each of our major programs. A highlight for the first quarter, which we were very pleased to announce was the January 30 FDA approval of our collaborator, Genentech's NDA submission for Erivedge for the treatment of adults with a type of basal cell carcinoma or BCC that has spread to other parts of the body that is metastatic or that has come back after surgery or that their healthcare provider decides cannot be treated with surgery or radiation. These subgroups are referred to as advanced BCC.
Now this is an extremely important event to Curis, its shareholders and more and most importantly, the patients that are suffering from advanced BCC. 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 through surgical excision when restricted to a small area of the skin, a small percentage of this population may progress to advanced BCC, whereby, their cancer has advanced further into the skin, bones or other tissues or spread to other parts of the body. In these cases, the disease is difficult to treat and is often debilitating and life-threatening.
Erivedge is now the only approved Hedgehog Pathway Inhibitor and also the only approved treatment for this advanced form of the disease. Prior to Erivedge approval, there was no approved medicine for this disease, and this is obviously a very important accomplishment for patients suffering from advanced BCC. Advanced BCC often results in severe deformity or impaired function of the affected organs. And patients historically have typically received 1 or more interventions including surgery, radiation and various chemotherapies, none of which are effective therapies for advanced BCC. So we believe that this approval has important financial implications for Curis.
As a result of this approval, we've earned a $10 million milestone payment from Genentech, and we expect Erivedge to provide Curis with potentially significant future revenues from royalties on Genentech's net sales of Erivedge in the U.S. market and the potential for expansion beyond the U.S. market. In addition, as of today, we are eligible to receive a $4 million milestone payment for acceptance of the filing in Australia and are eligible to receive potential additional milestone payments and royalties for development and regulatory approvals for Erivedge in advanced BCC in Europe and Australia. Erivedge is currently under review by the European Medicines Agency, or EMA, and by Australia's Therapeutic Goods Administration. Approval in either territory would increase patient access to Erivedge and also result in milestone payments to Curis.
Roche has indicated that it currently anticipates possible approvement by the EMA in either late 2012 or early 2013, but has not yet provided a timeframe for potential regulatory approval in Australia. Erivedge is also under review by Swiss and Canadian health authorities, further demonstrating Roche's global strength and also its commitment to providing Erivedge to patients with advanced BCC throughout the world. Roche recently communicated that it estimates 1.5% of all BCCs fall within the category of advanced BCC, and we believe that this represents a highly significant market opportunity for Erivedge.
In addition, Roche recently provided an update on the U.S. Erivedge launch, including that over 175 patients have received Erivedge and that Roche reported approximately CHF 5 million in revenue for the period from Erivedge's approval on January 30 through the end of the first quarter of 2012. Roche also noted that the initial Erivedge uptake was encouraging and that payer coverage was excellent with no significant reimbursement hurdles. Based upon the early market launch metrics and the estimates of potential patients, we believe that the advanced BCC market alone represents a significant value proposition for our shareholders, and we look forward to Erivedge's continued growth in the U.S, as well as its potential approval in other markets in the coming months.
Genentech's also conducting a separate Phase II clinical trial of Erivedge in patients with operable nodular BCC, which is a less severe form of the disease, and accounts for a significant percentage of the approximately 2 million BCCs diagnosed annually in the United States. We believe that the market opportunity within the operable setting may likely be the use of Erivedge as a neoadjuvant prior to surgery rather than to replace surgery itself. This Phase II trial is the first study to assess the ability of Erivedge to provide complete histological clearance of tumor as an important first step in determining the efficacy of Erivedge in less severe forms of BCC, where BCC lesions are generally treated surgically. This trial is designed to test Erivedge as a single agent therapy in approximately 75 patients with operable nodular BCC in a U.S.-based, open-label, 3-cohort clinical trial.
Patients in the first and second cohorts receive 150 milligrams daily oral dose of Erivedge for 12 weeks, while patients in the third cohort receive the drugs for 16 weeks of daily dosing with 2 8-week dosing cycles, covering -- surrounding a 4-week period for which patients will not receive Erivedge. They basically get a drug holiday after the first 8 weeks, then go on for another 8 weeks. The primary outcome measure for the first and third cohorts is the rate of complete histological clearance of the target nodular BCC lesions at the time of tumor excision 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. So I just want to give everyone a context and remind you that the reason the lesion is excised after surgery is to be able to demonstrate a clinical effect on the lesion based on histological analysis.
Data from the first cohort was published in April in the Journal of Investigative Dermatology, and will be presented at the upcoming Society of Investigative Dermatology Annual Meeting, taking place from May 9 through the 12th. This first cohort evaluated the safety and efficacy of 12 weeks of daily 150-milligram dosing of Erivedge in 24 patients with newly diagnosed nodular operable BCC. Patients then underwent most surgery with independent pathology review. And then for context, most surgery is a very systematic resection of the lesion, where they basically do a resection, look at it histologically under a microscope, go back, do another resection and you continue that process until there's no more evidence of lesion. A pathologically confirmed complete clearance in 10 patients that was 42% of the cohort, while clinical complete and partial responses were reported for 23 patients or 96%. This is extremely encouraging early data.
The most frequent adverse events or AEs were similar to those observed in previous studies with Erivedge, and primarily included muscle spasms and alteration in the sensation of taste, hair loss, fatigue and nausea. Most AEs were a grade 1 to 2, 7 patients reported grade 3 AEs, including 4 patients with a grade 3 muscle spasm, and no serious AEs were reported in the study. Eight patients discontinued from the study, including 2 due to AEs and accrual to cohorts 2 and 3 is ongoing with full study results expected in the first half of 2013. So again, we're very encouraged by this first cohort report, and we look forward to providing you with further updates as they become available.
In addition to the operable BCC study being conducted by Genentech, multiple trials in other tumor types are ongoing by third-party investigators and including the exploration of Erivedge in basal cell nevus syndrome or Gorlin syndrome, medulloblastoma, sarcoma, glioblastoma multiforme, as well as in pancreatic, small cell lung, gastroesophageal junction, gastric, breast and prostate cancers among others. Now the rationale for survey in these areas tumor types is buttressed by a wide range of data, demonstrating high levels of hedgehog expression in these tumor types. So we expect that some of these studies may yield data within 2012, and we look forward to providing additional updates on the Erivedge programs in the future as these data readouts become available.
It's important to note that the U.S. approval of Erivedge during the first quarter of this year represents a key catalyst towards the next stage of our corporate evolution. Furthermore, we have a number of upcoming potentially key value-creating events lined up for the coming months related to Erivedge. Also, we are continuing to advance our own Curis controlled pipeline, which includes our lead proprietary drug candidate from our network-targeted cancer programs designated CUDC-101, which is currently in an IV formulation, and we're also working on an oral formulation, and I'll elaborate upon that in a moment. CUDC-907, which we are advancing towards clinical testing, that's an oral formulation. And Debio 0932, which is our Hsp90 oral compound, which we have partnered with Debiopharm, currently testing in a Phase Ib trial.
I'm now providing -- I'll now provide an overview of the progress relating to these various programs, beginning with an update on CUDC-101, which is exemplary of our overall approach to designing novel drug candidates for cancer network disruption. 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. And this is what we mean by the concept of network disruption, in that we're hitting the cancer cell at multiple points of intervention, trying to provide a more durable disruption of the biology that the tumor cell is accessing.
We are continuing to recruit patients in our ongoing Phase I clinical trial with CUDC-101 in patients with locally advanced head and neck cancer, which is being used in combination with cisplatin and radiation. We have preclinical data demonstrating synergies when used with a standard of care. We recently amended the trial eligibility criteria to also include a subset of patients that are p16 positive, which is indicative of HPV-positive status and with a prior smoking history of greater than 10 packs per year, as well as of the original HPV-negative subset. This amendment provides a wider patient population to enroll in the study and is meant to capture the changing demographics of head and neck cancer by targeting the more aggressive forms of this cancer that are less responsive to standard chemoradiation therapy. We also believe that this amendment would potentially expand the addressable market segment for the drug. This primary objective of the study is to evaluate the safety and tolerability of CUDC-101 when administered in combination with the current standard of care of radiation and intermittent cisplatin, which is a chemotherapeutic drug.
Patients in the first cohort experienced no dose limiting toxicities when combined with standard of care, and appear to be receiving benefit from the treatment. A preliminary assessment of the first cohort has revealed highly encouraging responses, but we obviously need further numbers to build statistical confidence in these early, but encouraging observations. The successful completion of the first dosing cohort has allowed us to escalate to the next and final dose level of 275 milligrams per meter squared, our Phase IA maximum tolerated dose or MTD.
Accrual to this dose level is ongoing. Our current goal is to complete the dose escalation portion of this study at 275 milligrams per meter squared by the end of the third quarter of 2012, and then to treat approximately 10 additional patients at the MTD determined in the study in order to further characterize its suitability as the recommended Phase II 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 cisplatin and radiation therapy with or without CUDC-101 in 2013.
We view the head and neck cancer indication to be an ideal initial commercial path indication with our current IV formulation of CUDC-101, as the drug targets the primary driving mechanisms of the more aggressive forms of head and neck cancer. Also that synergy has been reported with HDAC inhibition and radiation. Our preclinical data has shown that CUDC-101 synergizes with cisplatin, and the IV dosing schedule aligns well with current standard of care, where patients must present to the clinic every weekday for 7 consecutive weeks. Importantly, we continue to make promising progress also towards an oral formulation of CUDC-101, and currently expect that we will file an IND and then begin a Phase I study in the second half of this year. Importantly, the oral formulation would allow us to expand potential clinical indications and provide greater dosing schedule flexibility.
Furthermore, an oral formulation would provide an opportunity to take advantage of what we've already observed and learned from the Phase I expansion cohort with the IV formulation with emphasis upon the potential of increasing drug exposure as a result of dosing schedule flexibility, afforded with an oral 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 we'll be -- and we'll present these observations of the full data from this study at an upcoming Medical Conference in 2012.
Now moving on to the additional drug candidates from our pipeline. I'll provide a brief summary of CUDC-101 -- I'm sorry, CUDC-907, followed by an update of our Hsp90 inhibitor. CUDC-907 is an orally available synthetic small molecule dual inhibitor of PI3 kinase and HDAC. And as we've accomplished with CUDC-101, we believe that this will provide a durable network suppression, and it is supported by preclinical data.
Just want to remind everyone that one of the limitations of PI3 kinase inhibition is that you see MEK upregulated as a bypass mechanism, and that's one of the attributes and benefits of our approach is we're blocking the primary single transduction, in this case, PI3 kinase and through the HDAC moiety. Supported by preclinical data, we appear to be preventing the access to the bypass mechanism.
So we've advanced an oral formulation of CUDC-907 towards clinical testing, and expect to file an IND during the second half of this year, and then to initiate a Phase I study. CUDC-907 is being developed in collaboration with the Leukemia and Lymphoma Society, or LLS, under which LLS will support our ongoing development of CUDC-907. Now under this agreement, LLS will provide approximately 50% of the direct cost for the development of 907 up to a total of $4 million. Our scientists recently presented clinical data on this drug candidate at the American Association for Cancer Research Annual Meeting in Chicago. Poster presentation focused on 907's biological activity in cell culture and animal models of various hematological cancers with a particular focus on multiple myeloma and B-cell lymphoma, which are the primary cancers to be explored in the Phase I clinical trial that we expect to initiate at the end of this year or early 2013.
In in vitro and in vivo testing, 907 outperformed a first-in-class HDAC inhibitor, as well as an investigational pan class I PI3 kinase inhibitor given as a single agent or in combination of both agents. 907 also demonstrated enhanced anti-tumor activity in animal models of B-cell lymphoma and multiple myeloma when co-administered with standard of care agents used in the treatment of patients with these malignancies.
Furthermore and importantly, the poster presentation also showed that many commonly used in vivo models of B-cell lymphoma and multiple myeloma expressed more than one PI3 kinase class I isoform, suggesting that a pan PI3 kinase inhibitor such as 907 may afford greater benefit in many cases than the PI3 kinase inhibitors that are focused and selectively on PI3 kinase isoforms. Accordingly, 907 showed greater biological activity than a delta-specific investigational inhibitor and a number of hematological cancers in vitro and showed greater growth inhibitory activity in animal models of non-Hodgkin's lymphoma. We look forward to providing further information on 907 as it becomes available.
I'd like to now provide a summary overview of 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. During the first quarter of 2012, Debiopharm advanced Debio 0932 into a Phase Ib expansion study. The primary objectives of this study are to further assess the safety profile, pharmacokinetics and pharmacodynamics of Debio 0932 and to make a preliminary assessment of antitumor activity.
Debiopharm expects that approximately 30 patients with advanced solid tumors will be treated in this portion of the study, including patients with non-small cell lung cancer. We are eligible for our next milestone under this agreement if and when Debiopharm treats its fifth patient in a Phase II clinical trial, assuming that Debiopharm advances 0932 into Phase II clinical testing. We currently anticipate that Phase II testing could initiate in the first half of 2013. Debiopharm had previously successfully advanced 0932 through a dose escalation portion of the Phase I study, and we expect that Debiopharm will present results of this Phase I study at the ASCO Annual Meeting in Chicago, taking place from June 1 to 5 of this year. We've been pleased with the progress that Debiopharm has made and the ongoing development of Debiopharm to date. And again, we look forward to providing you with further details of progress with this compound as they become available.
I'd like to now turn the call back over to Mike for financial discussions. And following Mike's comments, we'll open the call up for questions. Mike?