Core Insights - Molecular Partners AG is advancing its logic-gated CD3 Switch-DARPin T cell engager (TCE) designed for targeted immune activation in solid tumors, particularly ovarian cancer, by presenting new preclinical data at the SITC 2025 meeting [1][4] Group 1: Product Development - The Switch-DARPin TCE utilizes an AND-gate mechanism to activate T cells only when both mesothelin (MSLN) and epithelial cell adhesion molecule (EpCAM) are present, addressing limitations of systemic toxicity and efficacy in TCEs for solid tumors [2][4] - Preclinical data indicate that the Switch-DARPin shows selective T cell cytotoxicity against cells co-expressing MSLN and EpCAM, while exhibiting reduced activity against healthy tissues [3][6] - The T cells exposed to the CD2/CD3 Switch-DARPin demonstrated improved activation and proliferation compared to CD3 engagement alone, suggesting potential to mitigate T cell exhaustion [3][4] Group 2: Safety and Efficacy - Significant tumor regression was observed in a xenograft mouse model expressing MSLN and EpCAM, without systemic cytokine release, indicating a favorable safety profile for the Switch-DARPin [3][6] - The logic-gated approach allows for conditional immune activation, enhancing both efficacy and safety compared to traditional therapies targeting a single tumor antigen [4][6] Group 3: Company Overview - Molecular Partners AG is a clinical-stage biotech company focused on developing DARPin therapeutics, which offer advantages in multi-target specificity and high stability over existing protein-based drugs [5][8] - The company has a diverse pipeline with programs in various stages of development, primarily targeting oncology [8]