First Radio-DARPin Therapy (RDT) candidate MP0712 nominated; supporting preclinical package presented at SNMMI; initial clinical data expected in 2025
Strategic collaboration agreement signed with Orano Med to co-develop 212Pb-based RDT candidates for multiple oncology targets, including MP0712
MP0533 phase 1 dose escalation continues with cohort 8 open; clinical data update on amended dosing scheme expected in 2025
Switch-DARPin Platform: preclinical data supporting mechanism of action of Switch-DARPin concept and of first candidate MP0621 presented at EHA
MP0317 positive data of the completed Phase 1 trial presented at ASCO, confirming tumor microenvironment remodeling, favorable safety profile and dosing flexibility
Outlook: Funded into 2027 with cash and short-term deposits of CHF 159 million as of June 30, 2024, Molecular Partners expects total operating expenses of CHF 65 - 75 million in 2024
ZURICH-SCHLIEREN, Switzerland and CONCORD, Mass., Aug. 26, 2024 (GLOBE NEWSWIRE) -- Ad hoc announcement pursuant to Art. 53 LR: Molecular Partners AG ((SIX: MOLN, NASDAQ:MOLN), a clinical-stage biotech company developing a new class of custom-built protein drugs known as DARPin therapeutics ("Molecular Partners" or the "Company"), today announced corporate highlights and unaudited financial results for the first half-year of 2024.
"In the first half of 2024, we made substantial progress with our Radio-DARPin Therapy (RDT) platform. We nominated the first RDT candidate, MP0712 targeting DLL3, and we look forward to bringing it to patients in 2025 with our partner Orano Med, the leader in the 212Pb field. With them, we entered into a strategic collaboration earlier this year, to access and leverage their supply and manufacturing capabilities, as well as clinical experience, with radiopharmaceuticals, to co-develop Radio-DARPin Therapeutics together," said Patrick Amstutz, Ph.D., Molecular Partners' Chief Executive Officer. "Additionally, we progressed our immune cell engagers, including the cKit Switch-DARPin MP0621 into pre-clinical studies, and progressed MP0533 in AML to the top planned dose, seeing initial clinical responses and now testing dose intensification."
Research & Development Highlights
Radio-DARPin Therapy (RDT) Platform and MP0712Molecular Partners has leveraged the intrinsic properties of DARPins, such as small size, high affinity and specificity, to engineer Radio-DARPins as ideal vector candidates for radiopharmaceutical therapeutics and to create a Radio-DARPin Therapy (RDT) platform amenable to a broad range of tumor targets. Historically, small protein-based vectors faced challenges with kidney accumulation and toxicity, as well as suboptimal tumor uptake. Molecular Partners' RDT platform addresses these limitations with its half-life extension technologies and surface engineering approaches, while preserving the advantages of the small protein format.
Throughout H1 2024, Molecular Partners has continued to demonstrate the RDT platform's ability to deliver on its intended design. The Company has engaged with scientific experts in radiopharmaceutical innovation, as well as investor and clinical communities to build awareness of the unique offering of Radio-DARPins and to identify opportunities for potential RDT portfolio growth.
In January 2024, Molecular Partners entered into a strategic collaboration with Orano Med to co-develop 212Pb-based RDTs for patients with solid tumors. The partnership combines Molecular Partners' leadership in DARPins, as a highly differentiated modality for tumor-targeted delivery of radioisotopes, with Orano Med's leading expertise and capabilities in Targeted Alpha Therapy to further advance the RDT platform and expand Molecular Partners' RDT portfolio. 212Pb represents the next generation of targeted alpha therapies, with a selective, safe, and potent profile in patients: in addition to virtually endless supply of starting material, Orano Med has established robust and independent supply and manufacturing capabilities required for seamless delivery of targeted alpha therapies to clinical sites.
In June 2024, Molecular Partners nominated MP0712 as its first RDT candidate, a 212Pb-based DLL3-targeting RDT in its co-development program with Orano Med. The supporting preclinical data were presented at the Society of Nuclear Medicine and Molecular Imaging (SNMMI) 2024 Annual Meeting which took place in Toronto, Canada.
DLL3 is a priority target for radiopharmaceutical therapy based on its abundant expression in over 85% small cell lung cancer (SCLC) patients and other aggressive neuroendocrine tumors, while its expression in healthy tissues is low. SCLC is an aggressive form of lung cancer, with a poor five-year survival prognosis and a high unmet need for patients.
The data presented at SNMMI provide strong support for the clinical development of MP0712 in SCLC and other DLL3-expressing neuroendocrine tumors. In vivo data demonstrated strong and homogeneous tumor uptake, as well as substantial and durable inhibition of tumor growth at clinically relevant doses. Furthermore, the in vivo data suggested a favorable preclinical safety profile and support MP0712's potential for clinical use. Achieving favorable tumor to kidney ratios and biodistribution are key design objectives for this program. In both areas MP0712 performed well in mouse xenograft tumor models; tumor to kidney ratios over two were observed, and close to 60% of the injected dose per gram of tissue was detectable in the tumor.
The replicable learnings from the development and optimization of MP0712, as well as additional RDT platform improvements, are being taken forward to the broader RDT portfolio. Molecular Partners will present additional data in an oral presentation at the 2024 Congress of the European Association of Nuclear Medicine (EANM) in October 2024, and plans to initiate a first-in-human clinical trial of MP0712 in 2025.
In addition to the above updates, Molecular Partners continued to progress its RDT portfolio of projects in partnership with Novartis and is evaluating additional targets for RDT programs.
MP0533 MP0533, a novel tetra-specific T cell-engaging DARPin, is currently being evaluated in a Phase 1/2a clinical trial for patients with relapsed/refractory acute myeloid leukemia (r/r AML) and myelodysplastic syndrome/AML (MDS/AML) (ClinicalTrials.gov: NCT05673057). The mechanism of action of MP0533 is designed to preferentially kill AML cells (blasts, leukemic progenitor and stem cells) that express any combination of the three cell surface antigens CD33, CD123, and CD70, while sparing healthy cells, which tend to express only one or none of these targets. The immune activation against the malignant cells is achieved through CD3-mediated T cell-engagement.
In April 2024, comprehensive preclinical data supporting MP0533's proposed unique mechanism of action for the treatment of AML was published in Cancer Immunology Research (https://doi.org/10.1158/2326-6066.CIR-23-0692), a journal of the American Association for Cancer Research.
In the ongoing Phase 1/2a clinical trial, as of 29 July 2024, MP0533 has demonstrated an acceptable safety profile with the majority of adverse events reported being infusion-related reactions and cytokine release syndrome. Four clinical responses have been observed among the 28 patients across dosing regimens (DR) 1–6. These included a complete response in DR 4 and a morphologic leukemia-free state in three patients, one each in DRs 3, 5 and 6. Furthermore, an encouraging trend in bone marrow blast cell reductions was observed as of the data cut-off date; 7 of 26 evaluable patients and 5 of 11 patients with low disease burden at baseline (blasts <20%) displayed a blast reduction over 50%.
At present, data are being collected for DR7 and dose escalation continues with DR 8 open. Based on the observed safety profile and encouraging initial antitumor activity data, and following discussion with treating physicians and key opinion leaders, Molecular Partners is amending the protocol to further increase dosing and improve the exposure profile of MP0533. The Company's aim is to achieve higher response rates, as well as improved depth and duration of responses in r/r AML patients. Molecular Partners plans to present a clinical update on the program in H2 2024, and on the amended dosing scheme for MP0533 in 2025.
Switch-DARPin Platform and first candidate MP0621The Switch-DARPin platform represents a novel innovative DARPin-based approach by Molecular Partners that provides a logic-gated "on/off" function (the "Switch") to multispecific DARPin candidates, allowing target activation only in the presence of a defined set of antigens. The goal is conditional activation of a targeted immune response. The first Switch-DARPin program, MP0621 (cKit x CD16a x CD47), was introduced in January 2024 and is designed to induce killing of hematopoietic stem cells as a next-generation conditioning regimen. Molecular Partners' intends to extend access to potentially curative HSCT for more patients with AML as well as those with other hematologic malignancies or genetic diseases requiring HSCT.
In June 2024, the Company presented preclinical proof-of-concept data from MP0621 at the European Hematology Association (EHA) 2024 Hybrid Congress which took place in Madrid, Spain. The safety, efficacy and pharmacokinetic data supported MP0621's ability to selectively kill cKit positive cells and conditionally block the immunosuppressive protein CD47, with limited systemic side ...
