Daniel Karlin
Analyst · Leerink
Thanks, Rob. We remain highly encouraged by the enrollment trends we are seeing across our Phase III GAD and MDD studies. We've been spending a lot of time with our sites and investigators, and there is a high degree of excitement and engagement as we get closer to delivering top line data. As Rob mentioned, we are especially excited to deliver Emerge as our first pivotal readout in late Q2. While our Phase II Montgomery-Asberg Depression Rating Scale, or MADRS, results in GAD have given us great clinical confidence through the design and execution of Emerge, we have not previously had the opportunity to establish the efficacy of DT120 in a dedicated MDD population with patients in a major depressive episode. While GAD and MDD are substantially overlapping disorders, MDD is defined as an episodic illness with periods of euthymia or normal mood interrupted by major depressive episodes, which are characterized by dysthymia or depressed mood that must persist for at least 2 weeks and may last many months. GAD describes and is defined by a more continuous state of heightened anxiety. In our GAD program, starting with Phase IIb, we demonstrated DT120's remarkable ability to improve this continuous background condition, while our MDD program is intended to demonstrate the same effect on the course of major depressive episodes. Taken together, these data suggest that if approved, DT120 may represent a data-driven evidence-based clinical choice for providers and patients with the potential to improve patient outcomes, whether the patient is currently in a major depressive episode or not. Each of our 4 pivotal studies across GAD and MDD is comprised of 2 parts. Part A, a 12-week randomized, double-blind, placebo-controlled parallel group period, assessing the safety and efficacy of a single dose of DT120 ODT versus placebo, and Part B, a 40-week extension period with opportunities for open-label treatment. The primary endpoint in our MDD studies is the change from baseline in MADRS score at week 6 between DT120 ODT 100 micrograms and placebo. The MDD trials were designed with 80% powered to detect a 5-point improvement over placebo on this endpoint. The primary endpoint in our GAD studies is the change from baseline in the Hamilton Anxiety Scale, or HAM-A, at week 12 between DT120 ODT 100 micrograms and placebo. The GAD trials were designed to have 90% powered to detect a 5-point improvement over placebo on this endpoint. Our Phase III studies are modeled after our successful Phase IIb study in which we observed placebo-adjusted improvements of 7.7 points on the HAM-A and 6.4 points on the MADRS at week 12. In the context of other approved pharmacotherapies, which have typically shown a placebo-adjusted effect of less than 4 points on these endpoints, we believe DT120 has the potential to be not only a best-in-class product among psychedelics, but among anxiolytics and antidepressants broadly. And while placebo-adjusted changes are critically important for establishing efficacy, the absolute magnitude of improvement may be a more representative measure of the real-world patient experience. This is where DT120 even further stood out, having demonstrated a 21.9 point absolute reduction in HAM-A scores at week 12, corresponding with a 48% clinical remission rate and a 65% response rate. In addressing comorbid depressive symptoms, we saw an 18.7-point absolute reduction in MADRS scores at week 12. I'll now recap progress with our MDD studies. Enrollment is complete, and we expect to deliver top line data from Emerge in late Q2. Based on the progress in Emerge, we are moving forward with the execution of our second pivotal MDD study, Ascend. In Ascend, we are targeting enrollment of approximately 175 participants randomized 2:1:2 to receive DT120 ODT 100 micrograms, 50 micrograms or placebo. Our first sites in Ascend have been activated, and we expect to begin dosing by early Q2. We expect Ascend to continue to benefit from operational efficiencies that enabled the rapid enrollment of Emerge, including the ability to fast track select sites that participated in Emerge and those that are actively enrolling in our GAD program. Regarding our GAD program, we are in the final stages of enrollment in Voyage with completion anticipated in the coming weeks. In Voyage, we are targeting enrollment of approximately 200 participants randomized 1:1 to DT120 ODT 100 micrograms or placebo, while in Panorama, we are targeting enrollment of 250 participants randomized 2:1:2 to DT120 ODT 100 micrograms, 50 micrograms or placebo. Each GAD study includes a sample size re-estimation that allows for adjustment of the target enrollment based on a blinded evaluation of nuisance parameters. As Rob mentioned previously, we completed the sample size re-estimation for Voyage and determined that no increase in the trial sample size is required. In the initial study power calculation, we assumed a standard deviation of 10 points and a non-evaluable rate of 15% at week 12. Among the first 100 participants who completed week 12, we saw a model-based standard deviation of 6.7 points on the HAM-A and a non-evaluable rate of 10%. These observations suggest that the study's ability to detect a statistically significant drug effect substantially exceeds the planned power. In fact, if these nuisance parameters were to remain unchanged from the final analysis, this would imply that the study has over 99% power to detect a 5-point difference on the HAM-A and that the minimum difference required to achieve statistical significance would be less than 2 points. Beyond DT120, we are excited to have initiated our Phase II study of DT402 in autism spectrum disorder, or ASD, in late 2025. DT402, the R enantiomer of MDMA, has shown promising prosocial effects with a potentially favorable tolerability profile. We're developing DT402 to target the core symptoms of ASD, specifically addressing social communication that is central to the experience of the disorder. We believe this program represents another significant treatment opportunity given the high unmet need, the increasing prevalence of ASD and no FDA-approved therapies that specifically address these core symptoms. Having completed a Phase I single-ascending dose study that characterized the tolerability, pharmacokinetics and pharmacodynamics of DT402 in healthy adult volunteers, we dosed the first participant in our Phase IIa study and initial data is expected later this year. This study is a single-dose open-label design, assessing early signals of efficacy in up to 20 adult participants with ASD. The objectives and endpoints of the study are designed to characterize the pharmacodynamics and clinical effects of DT402 across multiple functional domains. Across our late-stage pipeline, we are making strong progress and rapidly approaching multiple pivotal readouts for our DT120 ODT program. We believe the remarkable profile of DT120 has the potential to be best-in-class among GAD and MDD pharmacotherapies, and we are confident in our strategy and execution to drive the broadest possible impact for the millions of patients in need. Now I'll turn it over to Matt for commercial comments on DT120.