Brett Haumann
Analyst · SVB Leerink. Your line is now open
Thanks, Rick. Starting on slide 5, 1473 is our oral gut-selective pan-JAK inhibitor that's designed to treat inflammatory intestinal diseases directly at the site of inflammation in an organ selective manner, with minimal systemic exposure or corresponding immunosuppressive effects. Our objective is to enhance efficacy and safety of the conventional systemic therapies. As Rick noted, 1473 is now in two late-stage studies in ulcerative colitis and Crohn's disease. Turning to slide 6, we recently announced the dosing of the first patient in a Phase 2b/3 called RHEA, a 1473 in patients with moderately to severely active ulcerative colitis. The Phase 2b dose-finding induction portion of the study assesses the effect of eight weeks of treatment for 1473 on changes from baseline in total Mayo score as the primary endpoint as well as assessing rates of clinical response and remission, endoscopic mucosal healing and safety. Patients who successfully complete the Phase 2 induction study are immediately enrolled into the Phase 3 maintenance portion of the study, which assess the ongoing efficacy and safety of 1473 for an additional 44 weeks. In parallel, we're conducting DIONE, a Phase 2 12-week randomized double-blind placebo-controlled study designed to evaluate 1473's efficacy and safety in patients with Crohn's disease, which began dosing patients at the end of 2018. The primary endpoint of this study is improvement in the Crohn’s disease activity index, CDAI measured to 12 weeks. Patients who complete the 12-week induction phase will continue into the active treatment extension phase where all patients receive open label 1473 for up to 12 months to continue to collect safety data. The breath of our 1473 clinical development efforts in both ulcerative colitis and Crohn’s disease, reflects our confidence in the potential therapeutic benefit of our unique gut-selective pan-JAK inhibitor. As illustrated on slide 7, we believe there is a compelling strategic and therapeutic rationale for designing organ-selective drugs for single organ diseases such as ulcerative colitis and Crohn's disease, which can provide a broader therapeutic index. Other companies are seeking to exploit the anti-inflammatory effects of JAK inhibition. However, pan-JAK inhibitors that are systematically active are phased with dose-limiting side effects that prevent these therapies from reaching the optimal doses required for full efficacy. Some companies have attempted to reduce systemic risk by focusing only on selective JAK1 inhibitors. However, these have been marked by evidence of systemic side effects as well. Unlike these efforts to fix the problem of systemic exposure, our approach is to avoid this. As shown on slide 8, we do this by designing compounds with organ selectivity to treat inflammation only in the tissue of interests. We design unique features into the molecule such as low solubility and low permeability to allow the drug to penetrate only into the intestinal wall. Any small amounts of drug, that do pass-through the full thickness of the gut-wall drain into the portal vein that flows directly to the liver where the drug is rapidly metabolized and cleared by first past metabolism to minimize the amounts of drug that get into the systemic circulation. Moving to slide 9, our confidence in the potential of 1473 as an innovative approach to the treatment of IBD is underscored by results of both preclinical and clinical studies that confirm gut selectivity. In addition, we know that 1473 is highly potent across all four JAK isoforms including Th2, which may play an important role in reducing the inflammation in Crohn’s disease. Th2 modulates both IL-12 and IL-23 both of which are blocked by STELARA an approved product for the treatment of Crohn's disease. We also have evidence that 1473 is not only active of producing inflammation at the luminal surface of the gut, but also at reducing the inflammatory cell infiltrate in the deeper parts of the gut wall. This effect is illustrated in the far right panels on this slide. The T cell infiltration stained in purple deep in the intestinal wall tissue in a preclinical animal model is shown in the upper frame and the reduction in staining due to 1473 is shown in the lower frame. We have previously reported encouraging Phase 1b data in ulcerative colitis. An additional data will be shared in an oral presentation at Digestive Disease Week or DDW in May. We're very excited to be collaborating with Janssen and in actively running the studies in both ulcerative colitis and Crohn’s disease and look forward to updating you as the year progresses on our enrollments and the expected readout from these studies. Let's turn now to slide 10 ampreloxetine a once-daily norepinephrine reuptake inhibitor or NRI in development for the treatment of patients with symptomatic nOH. As previously reported, we conducted a Phase 2 study in patients with nOH. In Part B of this study, patients who were treated with placebo showed an expected decrease in systolic blood pressure shown in gray on the plot. That was greatest during the period of the day the patients were awake, active and eating when their autonomic nervous systems were failing to produce adequate amounts of norepinephrine. In contrast, ampreloxetine shown in blue resulted in an increase in blood pressure during the portion of the day the patients needed it, by preventing the reuptake of norepinephrine into nerve endings. Importantly, at nights when the autonomic nervous system is less active and norepinephrine levels are lower, ampreloxetine did not result in any additional change in blood pressure thereby reducing the risk of supine hypotension that is observed with other treatments for nOH. In Part C of the study, patients were dosed with open-label ampreloxetine once daily for up to five months with the primary endpoint collected at four weeks. As shown, patients reported large improvements in their dizziness score as measured by validated nOH symptoms score referred to as OHSA question one. As Rick noted, upcoming scientific presentations at IIP RD in June and an oral presentation at ENC in July will highlight the efficacy, safety and tolerability data from the completed Phase 2 clinical trial, including the primary endpoint data at four weeks and the ongoing efficacy of 20 weeks of treatments with ampreloxetine. The five months data from the exploratory open-label portion of the study further suggests that ampreloxetine produces a durable clinical response for as long as treatment is maintained and that symptoms reemerge once patients stop taking ampreloxetine. Based on the positive results from the Phase 2 clinical trial and subsequent discussions with the FDA, we've also initiated the registrational Phase 3 program of ampreloxetine in symptomatic nOH. The Phase 3 program as illustrated on slide 11 includes two studies: a placebo-controlled four-week treatment study and a four-month open-label study followed by a six-week randomized withdrawal portion to demonstrate the durability of response. Both studies got underway earlier this year and are actively enrolling patients. Now to slide 12. An 8236, our lung-selective inhaled pan-JAK inhibitor for the treatment of inflammatory lung diseases, including steroid resistant asthma. The clinical goal in asthma is to prevent exacerbations and reduce symptoms in patients who remain poorly controlled on inhaled corticosteroids, despite being compliant on their medication. Some of these patients have what's referred to as Th2 high disease and they move onto systemic biological agents that carry the risk of systemic side effects. There are in addition patients with so-called Th2 low disease for whom biological agents are not beneficial, and who remain very difficult to treat. We believe 8236 has the potential to be the first inhaled non-steroidal anti-inflammatory to treat these patients with more severe asthma, regardless of whether their disease is characterized as Th2-high or Th2-low. 8236 is optimized for dry powder delivery to the lung and it's profile supports a once-daily inhaled product with minimal systemic exposure. We've initiated a Phase 1 study of 8236 including a repeat ascending dose portion in patients with asthma to ensure that 8236 is well tolerated following inhalation, but also to look at evidence of target engagement by assessing their levels of exhaled nitric oxide and other biomarker measurements from blood and bronchoscopy samples. The study is expected to complete in the third quarter of this year. Next, Frank will provide an update on the YUPELRI launch.