Dr. Serge Stankovic
Analyst · Cowen
Thank you, Steve. I’m extremely pleased with our recent R&D progress. Let me start by discussing the positive results of our Phase 2 CLARITY study. Moving to Slide 8. As a reminder, CLARITY was a Phase 2 randomized, double-blind, placebo-controlled, multicenter, 2-stage sequential parallel comparison SPCD study that evaluated the safety, tolerability and efficacy of pimavanserin 34-milligram once daily. Subjects received pimavanserin or placebo as an adjunctive treatment for up to 5 weeks in each stage. All study subjects were MDD patients who had an inadequate response to a stable dose of standard antidepressant therapy with either a selective serotonin reuptake inhibitor, SSRI, or serotonin norepinephrine reuptake inhibitor, SNRI. We assessed efficacy using the Hamilton Depression Rating Scale as the primary end point. We also assessed improvement using multiple additional relative -- relevant and clinically meaningful secondary end points, including the key secondary end point of Sheehan Disability Scale, or SDS, a measure of disability which reflects impairment on work, family and social activities, a major burden on patients. Let’s review the top line trial results on Slide 9. Pimavanserin met the prespecified primary end point by significantly reducing the 17-item Hamilton Depression Rating Scale compared to placebo with a p-value of 0.039. In Stage 1, all 207 study participants were randomized to pimavanserin or placebo for a parallel comparison. The positive improvements on HAMD were achieved immediately starting at week one and were sustained through the five week treatment period, reflecting an early and sustained effect. Stage 1 showed convincing antidepressant effect of pimavanserin across several independent end points. Our criteria for entering Stage 2 were a bit stringent and likely resulted in the selection of a small subset of difficult-to-treat patients where we did not see separation from placebo. As a result, only 58 patients entered Stage 2, which was only about half of what was originally anticipated. On Slide 10, I would like to take a moment to address the relative importance of Stage 1 and Stage 2 in an SPCD trial design. Last week, as part of an Advisory Committee to discuss a drug for adjunctive treatment of MDD, the FDA indicated while they have not endorsed at this time a specific analytical method for the SPCD trial design, they consider efficacy data from Stage 1, which is a traditional parallel comparison design to be most informative. So moving on, let’s take a look at the efficacy results we observed in Stage 1 of our SPCD trial. Turning to Slide 11. In addition to the robust positive results observed on the primary and key secondary end point, positive results were also observed for seven additional secondary end points, including improvement in sexual function, reduction in daytime sleepiness and responder rate, all of which provide us additional confidence that pimavanserin has the potential to be a truly differentiated antidepressant. Before leaving this slide, I would just like to also point out that in Stage 1, we saw a more than doubling in the percent of patients who achieved the response and remission. Approximately 53% of patients on pimavanserin were responders versus 25% on placebo, and approximately 24% of patients achieved remission on pimavanserin versus 11% on placebo. As you can see on Slide 12, in Stage 1, significant separation from placebo was achieved for the primary end point, the HAMD total score, starting immediately at week 1 and was sustained at all visits through week 5, where we see a p-value of 0.0003. The observed effect size from baseline to week 5 was 0.626. As a reminder, an effect size of approximately 0.3 is considered clinically meaningful in depression. The robustness of the results we observed in Stage 1 gives us confidence as we plan for our Phase 3 program because Stage 1, in essence, represents what would be a traditional randomized parallel comparison study of pimavanserin and placebo treatments that include all study participants. The key secondary end point in this study was Sheehan Disability Scale, which measures impairment in work, family and social activities. Looking at the Slide 13, in Stage 1, significant separation from placebo was achieved starting immediately at week 1 and was sustained at all visits through week 5, where we see a p-value of 0.0036. The observed effect size from baseline to week 5 was 0.498. In addition, we followed 174 patients who, in accordance with the protocol, received either pimavanserin or placebo continuously throughout the 10-week study period. This was prespecified evaluation with inferential statistics to derive p-value computed post hoc. As shown on Slide 14, the comparison between patients continuously receiving either pimavanserin or placebo over the entire 10-week period also yielded meaningful separation with positive p-values from week 2 through week 10 in favor of pimavanserin. We observed separation at a significant level of 0.0076 for the primary end point, HAMD total score; and an observed effect size of 0.497. In addition, we observed, at 10 weeks, a responder rate of 59% versus 35% for placebo, a delta of 24% with a p-value of 0.0037 and a remission rate of 41% versus 23% for placebo, almost double with a p-value of 0.014. Looking at the same analysis on the key secondary endpoint of SDS score on Slide 15, we achieved a p-value of 0.0094 and observed effect size of 0.469. These results support durability of response. On Slide 16, we note that in the study, we had a very low number of serious adverse events and adverse events leading to discontinuations throughout the entire 10 weeks of treatment. Looking at overall safety on Slide 17, pimavanserin was generally well tolerated with no adverse events reported in more than 10% of patients. In addition, we did not see any meaningful weight gain in the study. Turning to Slide 18. We are highly encouraged by these results in MDD and believe that this study could serve as 1 of the 2 pivotal studies necessary to submit as an sNDA for pimavanserin for the indication of adjunctive treatment for MDD. We plan to meet with the FDA to discuss the Phase 3 program at an end of Phase 2 meeting. Based on the robust positive CLARITY results, our plan is to initiate 2 Phase 3 parallel placebo-controlled studies in the first half of 2019. The MDD data also reinforces our confidence in the potential of pimavanserin to benefit patients in multiple disease states, representing significant unmet need and sizable commercial opportunities. Another large unmet need in CNS is dementia-related psychosis, which we discuss on Slide 19. We are very pleased with the advancement of the Phase 3 HARMONY study as enrollment continues to progress well. As previously shared, we expect to reach the prespecified number of events for the interim analysis in the HARMONY study in the second half of 2019. As a reminder, there is very high statistical threshold set for this interim analysis. Now let’s turn our focus to schizophrenia inadequate responder study on Slide 20. The Phase 3 ENHANCE study recently passed its prespecified futility analysis, and we expect top line data in mid-2019. On Slide 21, we highlight our schizophrenia negative symptom study. We anticipate completing enrollment in the Phase 2 ADVANCE study in the second half of 2019. Turning to Rett syndrome and trofinetide on Slide 22. Rett syndrome is a debilitating neurodevelopmental disorder that occurs predominantly in females following apparently normal development for the first 6 months of life. Currently, there are no approved medicines for this rare disease. We are progressing our manufacturing activities to support initiation of Phase 3 randomized, double-blind, placebo-controlled study evaluating trofinetide in the second half of 2019. This study will evaluate trofinetide and placebo in approximately 180 girls with Rett syndrome. We look forward to initiating this study as we know the Rett community is eager for the new treatment options. If our Phase 3 trial is positive, there is a potential to submit an NDA in 2021 based on this single Phase 3 study. I will now turn the call over to Michael to discuss our commercial performance.