Shanghai – October 18, 2026 -- Mabwell's Nectin-4-targeting antibody-drug conjugate 9MW2821 (Bulumtatug Fuvedotin, "BFv") achieved a 30.0% objective response rate in 60 efficacy-evaluable triple-negative breast cancer (TNBC) patients previously treated with a topoisomerase I (Topo I) ADC, according to Phase II data to be presented orally at the 2026 European Society for Medical Oncology (ESMO) Congress.