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Molecular Partners (MOLN) investor relations material
Molecular Partners Study update summary
Complete event summary combining all related documents: earnings call transcript, report, and slide presentation.Study background and rationale
MP0712 is a DLL3-targeting Radio-DARPin therapeutic evaluated for small cell lung cancer (SCLC) and other neuroendocrine cancers, leveraging high tumor uptake and retention via DLL3 replenishment and internalization.
The approach uses a DARPin vector with engineered half-life, partnered with Orano Med for isotope supply, in a 50/50 collaboration.
DARPins serve as ideal vectors for radiopharmaceuticals, with 212Pb as a potent therapeutic payload showing proven clinical efficacy.
SCLC is highly radiosensitive, and MP0712 is designed for manageable side effects and combinability with other mechanisms of action.
DLL3 is a validated target, but existing modalities (T-cell engagers, ADCs) have limitations in response rate and duration, supporting the need for radiotherapy.
Preclinical and imaging data
Imaging with 203Pb-MP0712 in SCLC patients demonstrated strong and sustained tumor uptake, including in liver metastases, with minimal healthy organ uptake.
Quantitative image analysis showed continued tumor uptake up to 116 hours, with healthy organ washout visible from 24 hours onward.
Tumor lesions demonstrated higher specific uptake than healthy tissues, with rapid and sustained accumulation over 24 hours and beyond.
Progressive uptake was observed across different tumor types, with ~80% of uptake reached at 24 hours and strong retention up to 7 days.
Data from five patients using diagnostic isotope 203Pb demonstrated promising tumor uptake and a clean profile in healthy organs.
Dosimetry and safety projections
Dosimetry analysis indicated kidneys and red marrow as the main dose-limiting organs, but all healthy organs remained within established safety limits at planned starting doses.
Hematologic recovery will be monitored to guide repeated dosing strategies, with anticipated transient drops in blood counts expected to recover.
Tumor retention was strong, with up to 80% uptake at 24 hours and little decline over time, supporting the therapeutic window for 212Pb treatment.
Dosimetry and biodistribution results validate the ongoing U.S. Phase 1/2a study design with 212Pb as the therapeutic payload.
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