Hengrui Pharma(SH:600276) 生物世界·2025-10-24 04:04Core Viewpoint - Antibody-drug conjugates (ADCs) targeting TROP-2 show promise in treating advanced or metastatic solid tumors, demonstrating good anti-tumor activity and manageable safety profiles [2][4][8]. Group 1: TROP-2 and ADC Development - TROP-2 is a member of the epithelial cell adhesion molecule family, frequently overexpressed in various epithelial cancers while showing low or undetectable levels in normal tissues, making it a suitable target for ADCs [1]. - The development of several ADCs targeting TROP-2 has been prompted by its role in cancer cell proliferation, invasion, metastasis, and self-renewal, often associated with aggressive disease and poor prognosis [1]. Group 2: SHR-A1921 Clinical Study - The study published in Cancer Cell reports on the first-in-human phase 1 trial of SHR-A1921, an ADC developed by Heng Rui Medicine, targeting TROP-2 in patients with advanced or metastatic solid tumors [2][3]. - SHR-A1921 consists of a humanized TROP-2 IgG1 monoclonal antibody, a cleavable GGFG peptide linker, and a DNA topoisomerase I inhibitor, designed to enhance stability and minimize premature release of the cytotoxic payload [3]. Group 3: Safety and Efficacy Results - In the trial, 132 patients (33.8%) experienced grade ≥3 treatment-related adverse events, with oral mucositis being the most common, affecting 57 patients (14.6%) [4]. - The overall objective response rate was 24.8%, with response rates in specific cancer types ranging from 18.2% to 43.1%, indicating variable efficacy across different cohorts [4]. - No significant correlation was found between TROP-2 expression levels and treatment outcomes, suggesting that other factors may influence efficacy [4]. Group 4: Optimal Dosage and Future Directions - SHR-A1921 demonstrated the best efficacy and safety balance at a dose of 3.0 mg/kg administered every three weeks, making it a candidate for further clinical trials [7][8].