Jay Feingold
Analyst · Matthew Harrison from Morgan Stanley. You may begin
Thank you, Jennifer. Beyond the first approved indication for ZYNLONTA, we are exploring opportunities to expand the addressable patient population into earlier lines of treatment and into additional histologies. As Chris mentioned earlier, updated data from the ZYNLONTA pivotal LOTIS-2 trial were presented at ASCO and ICML. The overall response rate was 48% and a complete response rate, 25%. As of the March 1, 2021 cut-off date, the median duration response increased to 13.4 months for all responders, with durable responses even in high-risk subgroups. In addition, the median duration of response for pre-responding patients was not reached. As a reminder, the patient population of this trial included patients who did not respond to first-line therapy or any prior lines of therapy. Patients who failed CAR-T therapy or stem cell transplant, and patients with high-grade B-cell lymphoma, including those with double hit and triple hit genetics. These results reinforce the efficacy and safety of ZYNLONTA as a monotherapy, a manageable safety profile and its convenient ease of administration. David recently presented at ICML in the LOTIS-2 trial of ZYNLONTA, in combination with ibrutinib for patients with relapsed or refractory DLBCL, or mantle cell lymphoma. Updated Phase I data showed encouraging efficacy and manageable toxicity, with an overall response rate of 67% and a complete response rate of 38% in non-GCB subtype DLBCL patients. Based on interim data from the ongoing Phase II trial, we've decided to amend the protocol to evaluate the administration of ZYNLONTA with every cycle to potentially further enhance efficacy and durability. Based on this additional data, we could potentially pursue a Phase III study in second-line DLBCL, expanding the addressable market and the number of patients who could benefit from ZYNLONTA. The Phase II portion of this trial continues to enroll. Our ongoing confirmatory Phase III LOTIS-5 clinical trial of ZYNLONTA in combination with rituximab, is intended to support the supplemental BLA filing as a second-line therapy for relapsed or refractory DLBCL patients not eligible for stem cell transplant. This trial continues to enroll patients, and we expect to complete the safety leading portion of this trial in the second half of the year. There are some plans to initiate several additionals in I, II trial in the second half of the year, including an umbrella trial in ZYNLONTA, the multiple combinations in relapsed/refractory B-cell non-Hodgkin lymphoma, and a dose-finding study in ZYNLONTA in combination with R-CHOP in previously untreated DLBCL patients. These trials will explore the expansion of the market into earlier lines of therapy across B-cell non-Hodgkin lymphomas. Pivotal Phase II trial in relapsed/refractory for B-cell lymphoma is now open for a moment as well. As Chris mentioned, we plan to file an M&A in Europe later this year based on the LOTIS-2 data. Moving to Cami. We have made progress in both, our Hodgkin lymphoma and solid tumor programs. We completed enrollment of our 117 patient pivotal Phase II trial in relapsed or refractory Hodgkin lymphoma. Updated interim results were presented at ICML and showed an overall response rate of 66% and a complete response rate of 28% in a heavily pre-treated population with a median of six prior lines of systemic therapy. Median duration response was not reached, and no new safety signals have been identified. We are encouraged by these results which highlight the potential to address an unmet medical need in heavily pre-treated Hodgkin lymphoma patients, most of whom have failed stem cell transplant, and all of whom have failed rituximab they don't need and a checkpoint inhibitor. We look forward to providing additional updates as these data continue to mature. We also continue to advance Cami with our ongoing Phase Ib dose escalation trial in combination with pembrolizumab in patients with advanced solid tumors. Data presented at ASCO show that Cami monotherapy has an encouraging safety profile as the maximum tolerated dose was not reached. It's also encouraging to see that treatment with Cami showed a significant increase in T effector to Treg ratio in a number of patients with T cell infiltration of the tumors, which is thought to be associated with immunovant anti-tumor effects. As our accounting program exemplifies, we are deploying a validated ADC platform in the treatment of solid tumors. ADCT-901, targeting the antigen KAAG1, is a novel first-in-class candidate for the treatment of patients with advanced solid tumors with higher medical needs, including patients with a platinum resistant ovarian cancer and triple-negative breast cancer. We filed the IND for ADCT-901 in the second quarter, which the FDA cleared, and we expect to initiate the Phase I study in the second half of this year. Another of our promising pipeline candidates, ADCT-601 is targeting AXL, which should overexpress many solitaires, such as lung, breast, prostate, pancreas, glioma and esophageal cancer. We expect to initiate the Phase Ib combination study in multiple solid tumors in the first half of 2022. In addition, our ADCT-602 program targeting CD22, continues to enroll patients in a Phase I/II trial for relapsed and refractory acute lymphoblastic leukemia in collaboration with MD Anderson. Finally, we have a robust R&D pipeline with six pre-clinical development programs, and we look forward to keeping you updated on our progress. With that, I will turn the call over to Jenn to give a financial update.