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Purple Biotech Expands CAPTN-3 Portfolio with IM1305, a Novel Tri-Specific Antibody Targeting TROP2

Core Insights - Purple Biotech is advancing the development of a tri-specific antibody targeting TROP2, which is part of its CAPTN-3 platform aimed at overcoming tumor immune evasion and drug resistance [1][2][8] - The company plans to submit an Investigational New Drug (IND) application for its first CAPTN-3 tri-specific antibody, IM1240, in 2026 [1] - Encouraging preclinical results have shown sustained tumor regression in human triple negative breast cancer (TNBC) models, with significant cell death in various tumor types at low doses [4][5] Company Overview - Purple Biotech Ltd. is a clinical-stage company focused on developing first-in-class therapies to combat tumor immune evasion and drug resistance [8] - The company's oncology pipeline includes CAPTN-3, CM24, and NT219, with CAPTN-3 being a preclinical platform of conditionally activated tri-specific antibodies [8][9] - The CAPTN-3 platform utilizes a unique mechanism of action that engages both innate and adaptive immune systems to enhance anti-tumoral responses [8] Technology and Mechanism - The tri-specific antibody IM1305 includes a masked anti-CD3 arm designed to reduce off-target effects while enhancing efficacy in the tumor microenvironment [3][6] - TROP2 is expressed in various solid tumors and is linked to poor prognosis, making it a significant target for therapeutic development [5][6] - The CAPTN-3 platform's ability to recruit multiple immune effectors (T and NK cells) is expected to provide a strong rationale for its effectiveness across diverse tumor types [6][7] Future Prospects - The company is optimistic about the growing interest in TROP2 as a therapeutic target and aims to leverage its technological advancements to accelerate development timelines [7] - Purple Biotech believes that its CAPTN-3 platform can generate multiple programs and expand partnership opportunities in the oncology space [7]