Eugene Sullivan
Analyst · Credit Suisse. Please go ahead
Thanks, Roger. This is a particularly exciting time for Insmed with a number of important clinical advancements taking place across all of our programs. I will address each of these. To begin with, we were thrilled with the outcome of the WILLOW study of once-daily INS1007 in patients with non-CF bronchiectasis. Let’s now turn to Slide 11 for an overview. To remind you, INS1007 is a novel, oral, reversible inhibitor of dipeptidyl peptidase 1, or DPP1, an enzyme that catalyzes activation of neutrophil serine proteases, or NSPs. NSPs are key mediators of neutrophil-driven inflammation, tissue damage, and excessive mucus production which are prominent features of bronchiectasis. The WILLOW data has highlighted a significant opportunity for Insmed representing a promising new approach to modulating neutrophil activity. Given its novel mechanism of action, INS1007 could have applicability in a broad range of diseases resulting in a pipeline of products. We are proud to have what we believe to be the most advanced program in development leveraging this new mechanism of action and are pleased with this first data in non-CF bronchiectasis. Bronchiectasis stands out as one of the more significant pulmonary diseases with no approved therapies. It is marked by frequent pulmonary exacerbations requiring antibiotic therapy and/or hospitalization. Prevalence estimates for non-CF bronchiectasis range from about 340,000 to 520,000 in the U.S. with significant overlap with patients who have NTM lung disease. Given the strength of the top-line results we observed in the WILLOW study, we plan to focus the Phase 3 program on bronchiectasis patients with two or more exacerbations within the prior year. According to our market research, this profile could represent approximately two-thirds of the potential U.S. patient population or 225,000 to 350,000 patients. Slide 12, depicts the Phase 2 WILLOW study design, 256 adult patients were randomized to one of three arms, 10 mg of 1007, 25 mg 1007 or placebo for 24 weeks with a four-week post-treatment follow-up. Turning to Slide 13, which shows the baseline characteristics across the three groups. The patient demographics highlight the severity of the condition. Over the 30% of patients have been hospitalized for exacerbation in the preceding two years, it is also notable to see that a significant portion of the patients had co-existing COPD or asthma, conditions where 1007 might also be expected to have an impact based on their underlying disease processes. Turning now to Slide 14, based on top-line data, the WILLOW study met its primary endpoint of high to first pulmonary exacerbation over the 24 week treatment period for both the 10 mg and 25 mg dosage groups of INITIATIVES 1007 compared to placebo. As we have previously disclosed, the pre-specified primary analysis demonstrated statistically significant results for both treatment groups with P values of 0.027 and 0.044 for the 10 mg and 25 mg groups respectively. Today, we can share the hazard ratios for each groups. As you can see, for the 10 mg group, the hazard ratio was 0.58 with a P value of 0.029. For the 25 mg group, the hazard ratio was 0.62 with a P value of 0.046. We believe these results are compelling. For a patient, this means that the risk of having an exacerbation over the course of six months could be reduced by up to 40% when treated with INS1007. Let’s drill down in this data and look at the hazard ratio by subgroups as shown on the four spots on Slide 15. Here you could see that for both the 10 mg and 25 mg doses, the point estimates of the hazard ratios favored INS1007 for nearly every subgroup. We view the consistency in this data across the various subgroups as quite compelling. The only subgroup that falls to the right-side of the hazard ratio of one is the small group of patients aged 75 and older in the 25 mg dose group. There were only 14 patients in this subgroup, which resulted in very large confidence efforts. Let’s move on to Slide 16. As we disclosed in our top-line release, treatment with INS1007 also results in a reduction in the frequency of pulmonary exacerbations versus placebo. This is an endpoint of particular interest, because the FDA has indicated that frequency of pulmonary exacerbation should be the primary endpoint in our Phase 3 program. Over the course of the six month study, patients treated with INS1007 experienced a 36% reduction in the frequency of events in the 10 mg arm with a P value of 0.041 and a 25% reduction in the 25 mg arm with a P value of 0.167 versus placebo. We expect that our Phase 3 program will run for one year. So we may see a magnified impact or more evidence of a dose response during that longer study. As we did for the primary endpoint, we also conducted a number of analyses to look at results for the frequency of exacerbations in various subgroups. The four slots for both doses are shown on Slide 17. The results of these subgroup analyses were very similar to those seen with the primary endpoint with nearly all the point estimates favoring INS1007. Let me take a moment to address some questions we received about the dose response curve. Because the effect sizes for the 10 mg and the 25 mg group were similar in the top-line analyses, it is reasonable to wonder whether the 10 milligrams is already at the top of the dose response curve for clinical efficacy. We think it is very important to examine the data carefully in order to understand whether the 25 mg dose might be expected to offer important additional clinical benefit over the 10 mg dose particularly in the setting of a longer Phase 3 program. Therefore, we are conducting a series of additional analyses to further explore the WILLOW data. For instance, we are evaluating weather factors such as randomization imbalances or outliers may have impacted the observed effect sizes and weather events that occurred soon after randomization before INS1007 could be expected to exert its effects may have obscured a signal of increased benefit of the 25 mg dose. In addition, examination of secondary endpoints and pharmacokinetic exposure response modeling will help us to better assess both dosing options. I know some of you have asked if we have seen evidence of an inverted dose response, if that is not the case. As we have drilled down into the data including the subgroup and sensitivity analyses discussed here today, we believe that we may have two viable doses to consider taking forward. The top-line results suggest that 10 mg might be nearing the top of the dose response curve but additional analyses may suggest that 25 mg might provide additional clinical benefit in a longer Phase 3 program. We are very encouraged by the strength and consistency of the efficacy data across both does groups and patient populations. Turning to safety shown on Slide 18. INS1007 was generally well-tolerated in the study. AEs were generally mild to moderate in nature. The most common AEs in patients in the WILLOW study were cough, headache, sputum increase, dyspnea, fatigue, and upper respiratory tract infection. Interestingly, the incidents of adverse events leading to discontinuation of treatment was actually higher in the placebo group and in either of the active treatment groups with 10.6% in the placebo group, 7.4% in the 10 mg group and 6.7% in the 25 mg group. When designing the study, we considered the generic abnormality that leads to near total absence of DPP1, a condition called Papillon-Lefevre syndrome. In this disease, patients experience symptoms that include periodontal disease and skin diseases. We designed this study to look more thoroughly at these areas to see a far more modest inhibition of DPP1 would result in any such findings. For example, because of the concern around periodontal disease, we implemented a rigorous dental monitoring protocol for this Phase 2 trial. Patients were examined by a dentist at baseline and twice during the course of treatment, which was intended to allow us to detect any evidence of potential effects. Treatment-emergent AEs were rated by severity and reassuringly, there did not appear to be any severe gingival periodontal events. We will certainly share this data with the regulatory authorities, but do not anticipate a lead for similar comprehensive dental monitoring during the Phase 3 program. We will continue to analyze the data and look forward to presenting a more complete review of the results at the ATS Conference in May in Philadelphia. We will also work with regulatory bodies to confirm the acceptability of our Phase 3 program. We are very pleased with the results we’ve seen in the WILLOW study. As a reminder, this is the largest Phase 2 trial ever conducted in bronchiectasis and the robust data from this trial reinforces our confidence in the program as we move into Phase 3. Beyond bronchiectasis, we believe that INS1007 has the potential to be effective in treating other neutrophil-driven diseases including cystic fibrosis. CF patients have even greater levels of serum neutrophil elastase than bronchiectasis patients and therefore we believe 1007 may also benefit CF patients by addressing the harmful effects of neutrophil elastase and inflammation and sputum production. While our core development interest remains with bronchiectasis and CF, there is biological rationale to believe that INS1007 may be applicable across a broad range of indications. For instance, DPP1 inhibition has the potential to be beneficial in areas such as asthma, in COPD, alpha 1 antitrypsin deficiency, GPA, inflammatory valve disease, lupus and rheumatoid arthritis. Our Phase 2 data may have unlocked a first-in-class mechanism with potential broad applicability. We believe we are just at the beginning of the journey with INS1007 and look forward to optimizing its development in the years to come. Let me now turn to our efforts around label expansion for ARIKAYCE. We are advancing ARIKAYCE in a frontline study, that if approved by FDA, would allow us to address the approximately 95,000 to 115,000 patients in the U.S. diagnosed with NTM lung disease and that will serve as a necessary to confirmatory study for ARIKAYCE as agreed in our post-approval requirement with the FDA. We anticipate that this study will also address frontline approval requirements for Europe and Japan using the primary endpoint of durable culture conversion. We plan for a study duration of 13 months with treatment for 12 months followed by one month on therapy. The primary endpoint of this study in the U.S. will be a composite patient reported outcome or a PRO in order to demonstrate clinical benefit as required by the FDA. As you can see in the latest study design captured on Slide 19, the validation of the PRO and the confirmatory study will run in parallel pending alignment with the FDA. We plan to initiate these trials in the second half of 2020. ARIKAYCE holds potential in Mycobacterium abscessus, the second most common NTM pathogen. We plan to advance into a registrational Phase 3 study in this indication as well. Let me also provide a brief update around two additional pipeline programs. As shown in Slide 20, behind 1007, we are advancing INS1009 for the treatment of Pulmonary Arterial Hypertension or PAH. We believe that 1009, our dry powder inhaled treprostinil prodrug formulation developed in our own labs has the potential to address limitations of existing prostinil therapies. Not only does INS1009 have potential as a long-lasting vasodilator, it also has the potential to the disease modifies as it has been shown to significantly affect vascular remodeling in animal models of PAH. In an animal model, INS1009 showed a better response than Sildenafil across a number of measures including Vasodilation, right ventricular hypertrophy, pulmonary arterial valve thickness and obliteration. We are planning for a steady cadence of data presentation around our work with INS1009 this year beginning with ATS in May. Designed for once-daily dosing, INS1009 may prolong the duration of treatment effects and could offer PAH patients greater consistency in reducing pulmonary arterial pressure over time. INS1009 also has the potential to reduce side-effects associated with treatment. We intend to file an IND and initiate a Phase 1 study of 1009 this year. Let’s now turn to Slide 21. Today, I am pleased to introduce a promising preclinical new chemical entity which we call RV94. We are evaluating RV94 for the treatment of gram-positive infections. This compound has been under development for several years in our labs. RV94 is a Semisynthetic lipoglycopeptide designed to be used once-daily or less frequently by inhalation in CF patients with pulmonary MRSA infection. By inhibiting peptidoglycan synthesis and disrupting the bacterial cell membrane, RV94 is designed to help reduce sputum bacterium load and by virtue of inhalation delivery to reduce systemic drug exposure. From a clinical perspective, our aim with inhaled RV94 is to help improve pulmonary function and respiratory symptoms and to reduce the frequency in exacerbations and overall antibiotic usage. In an in vitro MRSA MIC assay, RV94 was 30 fold more potent than the existing standard of care antibiotic, vancomycin. In addition, RV94 has shown up to 60 fold greater potency than Vancomycin for the treatment of gram-positive MRSA pulmonary infections in animal models. If further research continues to be supportive and if already RV94 were to be approved, this novel antibiotic would represent a major step forward in the treatment of CF patients with pulmonary MRSA. Let’s now turn to Slide 22. Taking a step back, and looking at our product portfolio more broadly, we want to draw your attentions to the commercial overlap between our programs, particularly when you look at NTM, bronchiectasis and CF. In ARIKAYCE, we have an improved therapy for refractory MAC in the U.S. We know that many CF patients also have NTM lung infection. According to the CF Foundation website, 13% of CF patients in the U.S. tested positive were NTM species in 2017. In addition, approximately 30% of bronchiectasis patients have NTM lung disease. For 1007, with the positive WILLOW data, we are now one step closer to bringing forward a product for bronchiectasis and we have a new mechanism of action that we believe may help treat the inflammation and sputum production and CF. MRSA is becoming more common in CF patients and is now found in about 25% of patients with the disease. Studies show having MRSA lung infections for longer than two years can affect survival rates in CF patients. Therefore we believe we have a unique opportunity to address an unmet need in CF with RV94. And with that, I’ll pass the call to our Chief Financial Officer Sara for the financial update.