On May 13, 2025, the clinical research results of ESG401, a TROP2 ADC drug developed by Escugen Biotechnology for treating brain metastasis in patients with advanced HER2-negative breast cancer, were officially published online in ESMO Open, a well-known international medical journal hosted by the European Society for Medical Oncology (ESMO). The paper is titled "Novel TROP2 antibody–drug conjugates for treatment of HER2-negative metastatic breast cancer patients with brain metastases: a promising option." The article reports the efficacy and safety data of ESG401 in HER2-negative breast cancer patients with brain metastasis.