Timothy Whitten
Analyst · WedBush Securities
Thank you, Brian. Hello, everyone, and thank you for joining us on today's first quarter 2012 conference call. I'm pleased to report, as you all likely saw yesterday, that FDA has lifted the clinical hold previously placed on ARIKACE in cystic fibrosis patients who have Pseudomonas lung infections. We're certainly pleased by the complete lifting of the clinical hold, and it is really a milestone event for the company, which I'll come back to in a minute.
It's also very important to discuss the significant progress we've made moving our current ARIKACE development program forward in the 2 months since our last quarterly call. We have started dosing for our clinical evaluation of ARIKACE Phase III study with CLEAR-108, which is being conducted in Europe and Canada in CF patients who have Pseudomonas lung infections.
And as you may know, we've previously announced our intention to proceed with the Phase II clinical trial of ARIKACE in patients with nontuberculous mycobacteria or NTM lung disease. We expect to begin dosing patients in that trial in the middle of the year and are currently taking a number of important steps towards meeting that objective. Finally, we initiated the 9-month dog inhalation toxicity study towards the end of April, which is in line with our previous projection of starting the study in the second quarter.
With that as a brief overview, let me first provide further detail on CLEAR-108. Our goal is to conduct this trial in about 18 countries. In most countries, you need both the individual country's competent [ph] or regulatory authority to approve the trial, as well as the relevant ethics committee approval. We've made significant progress in obtaining these approvals. And to date, we've received regulatory and ethics committee approvals from 14 countries, including what I referred to as the Big 5 in Europe, that is Germany, France, Italy, Spain and the United Kingdom. And importantly, we've also received the appropriate regulatory and ethics committee approvals in Canada.
I'm quite pleased with the progress we've made in such a short period of time in getting this trial up and running. And I'd like to thank my fellow Insmed employees for their hard work in making this happen. Based on our current progress, we are projecting that top line efficacy and safety data will be available in mid-2013. Once CLEAR-108 is fully enrolled, we will provide a further update to the market.
Before I move on to NTM, as a reminder, here are some of the details related to CLEAR-108's design. It's a randomized Phase III trial comparing ARIKACE to Novartis's Tobi, which is a commercially available inhaled antibiotic containing tobramycin. ARIKACE 560 milligrams will be delivered once daily over about 20 -- excuse me, about 12 to 13 minutes via an investigational eFlow Nebulizer System as manufactured by PARI Pharma. 300 milligrams of Tobi will be delivered over about 30 to 40 minutes per day in 2 divided doses, utilizing the Pari LC Plus Nebulizer. CLEAR-108 is expected to enroll approximately 300 patients.
The primary endpoint is change in pulmonary function or FEV-1 measured after three 28-day on treatment and three 28-day off treatment cycles or about 6 months. A key secondary endpoint is time to pulmonary exacerbation. In general, pulmonary exacerbation can be defined as clinical need for additional treatment as indicated by a recent change in clinical parameters or sometimes it's simply defined as a temporary worsening of lung function due to an infection or inflammation and can be characterized by things such as increased cough, fever, shortness of breath, change in sputum, fatigue, et cetera.
The study design and the endpoints were previously agreed upon by Insmed and the European Medicines Agency. Patients who complete CLEAR-108 will be eligible to enroll in a long-term, open-label extension study called CLEAR-110, in which patients will receive ARIKACE 560 milligrams once daily for 28 days, followed by a 28-day off treatment period in a cyclic manner for up to 2 years. Open label means that both the patient and physician know they are receiving ARIKACE.
Moving on to NTM. As I said earlier, we are progressing nicely toward reaching our goal of initiating the Phase II clinical trial for ARIKACE and its indication in mid-2012. The Insmed team is working expeditiously in an effort to get this trial started at the earliest opportunity. As a reminder, this Phase II clinical trial will be a randomized placebo-controlled study of ARIKACE in approximately 100 adult patients who have recalcitrant non-TB mycobacteria lung disease. To be eligible for inclusion in the trial, a patient is considered recalcitrant or resistant if they have been on a multidrug regimen for at least 6 months with persistently positive mycobacterial cultures.
Patients who are NTM culture positive while receiving treatment will continue with their multidrug antibiotic regimen and receive additionally either ARIKACE 560 milligrams or placebo once daily, delivered via an optimized investigational eFlow Nebulizer System. The primary efficacy endpoint will be change in mycobacterial counts from baseline to the end of 84 days of treatment. At the conclusion of the randomized portion of this study, eligible patients will receive ARIKACE 560 milligrams once daily for an additional 84 days in an open-label design, which is primarily to measure longer-term safety and efficacy.
The clinical trial design was previously agreed upon by Insmed and the FDA, and we are currently projecting that top line results from the randomized portion of the study will be available in the fourth quarter of 2013. As I mentioned above, we have started the 9-month dog inhalation toxicity study of the ARIKACE, previously planned to be initiated in the second quarter. We currently expect to have top line data available from the study in the second quarter of 2013.
Finally and importantly, we announced yesterday that FDA lifted the clinical hold previously placed on ARIKACE in CF patients. Insmed has reached agreement with FDA on a revised CF clinical trial population, consisting of adult patients who have chronic Pseudomonas lung infections and FEV-1 % predicted from 25% to 75%. The company is continuing discussions with the agency in an effort to finalize additional details of the Phase III study protocol for the potential clinical trial.
At the same time, the company is evaluating possible next steps for the ARIKACE U.S. CF clinical program, given the current progress and anticipated resource requirements of CLEAR-108 and the NTM clinical programs. We currently expect to provide the market with an update on our strategy and priorities before the end of the second quarter.
Before I turn the call over to Kevin, let me conclude by saying that I'm excited and I really am excited about our current activities with ARIKACE, having recently initiated a key clinical trial with CLEAR-108 and nearing the start of another non-TB mycobacteria. In addition, the removal of the clinical hold for CF in the U.S. was an important step for the company, and we're really pleased to have that completed. We continue to believe that ARIKACE provides a late-stage, potentially highly differentiated opportunity, with significant global potential in cystic fibrosis and non-TB mycobacteria, both of which are key orphan indications that have high unmet medical needs.
That concludes my prepared remarks. With that, I will now pass the call over to Kevin to discuss the financials. Kevin?