Jim Dentzer
Analyst · Truist Securities. Please go ahead
Thank you, Diantha. Good morning, everyone, and welcome to Curis' fourth quarter business update call. We made great progress this quarter in both NHL and AML. Let's start with our TakeAim Lymphoma study which is evaluating emavusertib in combination with ibrutinib in PCNSL. Before we discuss the clinical data, I'd like to highlight the encouraging feedback we received from the EMA and FDA on the potential for conditional marketing authorization in Europe and accelerated approval in the U.S. As a reminder, we engaged both agencies about the potential for accelerated filings after the initial early data from PCNSL patients treated with emavusertib in combination with ibrutinib last year. We met with the agencies in the second half of 2024 and are pleased to announce that both agencies reviewed and provided feedback on our proposed plans for the potential for an accelerated approval pathway based on our ongoing TakeAim Lymphoma study. As a reminder, the study is a single-arm open label study being conducted in the U.S., EU and Israel using ORR as the primary endpoint. Both agencies agreed that patients already enrolled in the trial can be used in the submission as long as they meet the same inclusion/exclusion criteria. They also provided helpful guidance on additional information such as contribution of effect to be included as part of the submission and initial thoughts on the design of our confirmatory study. In short, the discussions were very productive. The development timeline for emavusertib just got accelerated. Our current Phase1/2 study is now registrational for both the U.S. and Europe. Obviously this is the outcome we were hoping for with over 30 clinical sites now open for enrollment, our goal is to complete enrollment in the next 12 to 18 months. With that, let's turn to the clinical data. As a reminder, we're testing the emavusertib ibrutinib combination in two distinct PCNSL populations, BTKI naïve patients and BTKI experienced patients. The thesis for the emavusertib ibrutinib combination, supported by both preclinical data and clinical data, is that blocking both of the pathways driving disease in NHL, blocking the TLR pathway with emavusertib and blocking the BCR pathway with ibrutinib maximizes down regulation of NF-ĸB and can enable patients to achieve an objective response even if they've been previously treated with a BTK inhibitor and progressed on that treatment. In our press release this morning, we summarized the clinical update for 27 relapsed refractory PCNSL patients in our TakeAim Lymphoma study, including 20 BTKI experienced patients and 7 BTKI naïve patients. Among the 20 BTKI experienced patients, change in tumor burden data were available for 13 of them at the cutoff date. Nine of these 13 patients demonstrated a reduction in tumor burden, including six objective responses, four CRs and two PRs, with three of the four CRs lasting more than six months. Among the seven BTKI naïve patients, change in tumor burden data were available for six of them at the cutoff date. Five of these six patients demonstrated a reduction in tumor burden, including five objective responses, one CR and four PRs. In summary, we're very encouraged by both the clinical data and the clarity from EMA and FDA on our proposed registrational plans. Over the next 12 to 18 months, we'll be focused on enrolling 30 to 40 additional patients to support a filing for accelerated approval. Finally, to cap off our progress in NHL this quarter, we're pleased to announce that emavusertib has been granted Orphan Drug Designation for primary CNS lymphoma in both the U.S. and in Europe. With that, let's turn to AML. At the ASH conference in December, Dr. Eric Winer from Dana-Farber presented data for 21 patients with a FLT3 mutation who had received fewer than three lines of prior therapy and were treated with emavusertib as monotherapy at the RP2D of 300 mg bid. These data show a 38% composite CR rate in the salvage line setting with 10 objective responses in 19 response-evaluable patients, six full CRs, two CRs with partial or incomplete hematological recovery, and two morphologic leukemia free state responses. We were especially encouraged to see that these responses were achieved rapidly with 7 of 10 responses reported at the first assessment. To put these data in context, we know that FLT3 patients in the relapsed refractory setting typically receive gilteritinib, a FLT3 inhibitor which was approved with a composite CR rate of 21%, and it's important to remember that this 21% rate was in an ideal population of patients predominantly naïve to FLT3 inhibition. The emavusertib study, on the other hand, was in salvage line patients. Over 80% of the patients on emavusertib had already been treated with a FLT3 inhibitor and failed. We believe the reason emavusertib data were so compelling is its novel mechanism of action. It blocks both IRAK4 and FLT3. For several years it has been suggested in the literature that blocking IRAK4 can enable patients to overcome adaptive resistance to FLT3 inhibition. These clinical data clearly support that thesis. Finally, I'd like to provide an update on our progress with the Triplet Study in Frontline AML. As a reminder, in 2024 we initiated a Phase 1 study of emavusertib as an add on agent to venetoclax and azacitidine in Frontline AML. This study is assessing safety and tolerability where emavusertib is added to a patient's ven/aza regimen in 7, 14 and 21 day dosing regimens after they have achieved a CR on ven/aza and while they remain positive for minimal residual disease. We have successfully completed the seven day cohort and enrollment of the 14-day cohort is currently ongoing. In short, we had a very productive 2024 and have entered 2025 with positive momentum. We look forward to providing you with additional updates as the year progresses. With that, I'll turn the call over to Diantha for the financial update. Diantha?