Guy Goodwin
Analyst · Cantor Fitzgerald. Your line is open
Thank you, Kabir, and good day, all. Let me begin by reviewing our Phase 3 pivotal program design, the details of which we communicated during our Capital Markets Day presentation, which is available on our website in the Investors section. As a high-level overview, we are focused on building an overall data set, which will form the cornerstone of our new drug application with the FDA. We are also looking beyond the approval to launch as well by generating the evidence that we believe will support reimbursements for this novel treatment at scale. Our pivotal Phase 3 trials are designed to answer two important clinical questions. First, can we replicate and reconfirm the compelling treatment response exhibited in our Phase 2b trial? And second, what is the impact of an additional dose on the number of responders and the quality of the response seen in the Phase 2b trial? To generate the data that answers these questions, we will conduct two clinical studies: a single-dose monotherapy trial we've named COMP 005; and a fixed repeat-dose monotherapy trial named COMP 006. These designs can answer additional important questions such as, how does the safety profile of COMP360 compare to placebo? And how may the response differ between one dose and two doses of 10 milligrams or 25 milligrams? We also recognize the need to look at long-term follow-up study that may include elements of durability and retreatment. Let me point out that the robustness of the Phase 2b trial, 233 patients in 22 sites in 10 countries and seven languages, provides us with confidence that we can deliver a successful Phase 3 results. Our Phase 2b trial went far beyond the scope of what traditionally have been smaller, signal-generating studies. The Phase 3 patient population will also be essentially the same as in our Phase 2b trial. That is the same definition of treatment-resistant depression and the same core inclusion and exclusion criteria, which aids in our extrapolation from the Phase 2b trial to our Phase 3 trial size and powering. Both of our pivotal studies have a primary endpoint of change from baseline in MADRS total score at week 6. The week six endpoint is consistent with previous trials in depression. We will also be observing the patients at periodic points along the way to the week six endpoint measurement. Providing more detail on the pivotal trial, COMP 005 is a single-dose monotherapy trial comparing a 25-milligram dose of COMP360 versus a true placebo. Drawing upon the experience with Phase 2b and the treatment effect we observed, and taking into account a 2:1 randomization to 25 milligrams, we have determined a trial size of 378 patients. We expect that top line data from this trial will be available by the end of 2024. The second pivotal trial is the fixed repeat-dose monotherapy COMP 006 trial with three arms comparing COMP360 doses of 25, 10 and one milligram. Patients will receive the same dose at day one and at week 3. With the three dosing arms and the 2:1:1 randomization, we have determined a trial size of 568 patients. Top line data is expected to be available in mid-2025. The third Phase 3 program trial is a long-term observational follow-up study, the design of which will be influenced by the observations and results of the Phase 2b follow-up study which we announced today in our quarterly results. The 66 patients entering the Phase 2b follow-up study were in varying states of response and may not have been fully representative of the main study population. These limitations demand caution so that our conclusions are preliminary and require confirmation in the larger follow-up study we will conduct in Phase 3. The primary endpoint of this Phase 2b follow-up was the median time to a new depressive event. Depressive events are, for example, initiation of new antidepressant treatment, hospitalization due to depression or suicidality, MADRS worsening, discontinuing -- discontinuation for adverse events or lack of efficacy. The time to such an event was longer, 189 days, for the COMP360 25-milligram group compared to the COMP360 1-milligram group at 21 days and the 10-milligram group intermediate at 43 days. The small group in the study that initially responded or remitted with COMP360 25 milligrams appeared to have durability up to approximately six months. 27 or 40.9% of participants had an adverse event that was ongoing or started after week 12, and a lower proportion of participants started new treatments for depression in the 25-milligram and 10-milligram arms versus the 1-milligram arm. Suicidality, which is a regrettable risk in this population, was recorded as an adverse event twice in 25-milligram group, twice in the 10-milligram group and once in the 1-milligram group. These findings also dovetail into our investigation of what a second administration of COMP360 may achieve regarding durability, response and remission. It will give us additional safety information beyond the more than 500 participants who have been exposed to COMP360 so far. And with that overview, Mike, I hand it over to you.