Patients (pts) aged ≥18 years with locally advanced/metastatic solid tumors refractory to/relapsed from standard treatment with measurable disease (RECIST v1.1) were eligible. ESG401 is administered intravenously...The ORR and DCR were 36% (4/11) and 64% (7/11) in 11 TRD pts with TNBC, while 62% (8/13) and 77% (10/13) in 13 TRD pts with HR+/HER2-BC...