Fred Cohen
Analyst · Oppenheimer. Your line is now open
Good morning, everyone. As Matt stated, we are excited by the positive top-line results generated for RECORLEV in the pivotal Phase III SONICS study. I will review the data shortly, but before doing so, I would first like to thank all of the clinical investigators, the patients and their families, as well as the Strongbridge team for all of their hard work and commitment that allowed us to reach this important milestone today. I will begin by laying out the framework for the SONICS study to help contextualize the data. SONICS is an open-label Phase 3 study of RECORLEV as a treatment for endogenous Cushing's syndrome that enrolled 94 patients at centers across North America, Europe and the Middle East. The SONICS study consists of three phases, a dose titration phase, a six-month maintenance phase and a six-month extended evaluation phase. Each patient who was enrolled in the study started out at the same dose of 150 milligrams twice a day. Then he or she, if needed, increased the dose in 150 milligram increments until reaching normalization of urinary free cortisol or UFC or until reaching a maximum tolerated dose or until reaching the maximum allowed dose of 1200 milligrams daily. UFC represents cortisol that has been filtered from the blood into the urine. If UFC is elevated it is diagnostic for the presence of cortisol excess and blood and also serves as a marker for Cushing's syndrome progression or therapeutic response. In fact, just last month the FDA acknowledged this via published guidance listing UFC as an established surrogate marker for drugs that are intended to treat Cushing's syndrome. The maintenance phase of the study was six months in duration. The primary end-point is defined as a proportion of patients enrolled who have normal mean 24-hour UFC following six months of treatment in the maintenance phase without a prior dose increased during this phase. To illustrate the stringency of the primary endpoint definition, as well as the burden on patients participating in the study, I would like to describe the patient urine collection requirements and their criteria to be considered a UFC responder for the primary efficacy analysis. With regard to UFC collection throughout the study, patients were asked to collect at least two 24-hour urine samples every two weeks during those titration, and at least two 24-hour urine samples a month during maintenance. With regard to the criteria to qualify as a responder in the primary endpoint analysis, a patient must have met three of the following four criteria as applicable. First, a patient must have had at least two adequate baseline and six-month UFC samples available for analysis. Second, they must have had normal, in other words, at or below the upper limit of normal, mean 24-hour UFC on the basis of those adequate 24-hour urine samples. Third, they must not have increased the dose of RECORLEV left during the entire maintenance phase. And finally, for the ten patients who are enrolled that have a recent history of pituitary radiation, they must have exhibited a rebound increase in mean UFC above the upper limit of normal following a two-week minimum withdrawal period of RECORLEV at the end of the maintenance phase. As mentioned, 94 patients were enrolled. Their average age was 44. 82% were female, 49% were of childbearing potential. 96% were white; the median body mass index was 29. Importantly, 38% had a diagnosis of diabetes at baseline. 71% had a diagnosis of hypertension and 36% had a diagnosis of hypercholesterolemia. Of the 94 enrolled 77 patients completed dose titration and advanced to the maintenance phase of whom 61 completed the maintenance phase. Of the 94 enrolled 30% met the stringent UFC response criteria. When relaxing the primary endpoint requirement that their dose could not have been increased during maintenance 38% were complete UFC responders and 10% were partial responders which is the least of 50% UFC reduction for baseline, an overall month six relevant UFC response rate of 48%. Considering just those patients who entered the maintenance phase, approximately 75% achieved either a complete normalization or a partial UFC response at month six. As far as key secondary endpoints of cardiovascular risks, including fasting blood glucose, hemoglobin A1C, total cholesterol, low-density lipoprotein or LDL cholesterol, body weight and body mass index. RECORLEV demonstrated statistically significant and clinically meaningful improvements from baseline. The p-values for each of these changes from baseline were less than 0.0001. Turning to safety and tolerability. Liver tests abnormalities were among the pre-specified adverse events of special interest. Importantly, in the SONICS study there were no cases of severe liver toxicity reported; specifically there were no high GLO cases or transaminase values above 20 times the upper limit of normal. Overall, liver related adverse events of special interest were reported among 7.4% of patients enrolled. Looking at the liver function lab test data collected over the course of the study through maintenance, findings of alanine aminotransferase or ALT greater than three times the upper limit of normal were observed among 10.6% of patients, and levels greater than five times the upper limit of normal were reported among 3.2% of enrolled patients. Of relevance, when considering the potential for drug-induced liver injury, there were no patients that had a total bilirubin level more than 1.5 times the upper limit of normal at any time during the study through maintenance. In addition to liver related adverse events, adverse events of special interest also included events potentially relating to QTc interval prolongation and adrenal insufficiency. Regarding QTc interval prolongation this adverse event was reported among 5.3% of the population and was never associated with arrhythmias. Adrenal insufficiency was reported among 3.2% of the population. There was no apparent relationship between the dose of RECORLEV used and any adverse event of special interest. All of the adverse events of special interest were fully reversible and do not result in clinical sequelae. Other safety and tolerability findings based upon data collected through six-month maintenance indicated that RECORLEV was generally well tolerated. To summarize key safety findings, 12 patients or 12.8% discontinued treatment with RECORLEV due to an adverse event. For the two most commonly reported adverse events, no patients discontinued treatment due to nausea and one patient discontinued treatment due to headache. Fourteen patients or 14.9% reported one or more serious adverse event, of whom four were deemed drug related by investigators. One patient's death was reported due to colon cancer and was not considered drug related. We are committed to completing the SONICS study and estimate reporting final results in the fourth quarter of 2019. In addition, we are also actively enrolling LOGICS, our placebo-controlled double-blind randomized withdrawal study in patients with Cushing's syndrome, and expect to report top-line data in the first quarter of 2019. Excuse me, it's the first quarter for the SONICS study completion. The impressive top-line results of the SONICS study suggest that RECORLEV is an effective and well-tolerated cortisol synthesis inhibitor in Cushing's syndrome. Based upon these compelling data, we look forward to discussing the SONICS data with the FDA, and the potential for an accelerated approval pathway for RECORLEV, and also, to continuing our discussions with regulators around the world. I will now turn the call back over to Matt. Matt?