e23257 Background: Clinical research competence determines the quality of clinical research and the reliability of research findings and is vital in the development of new antitumor drugs and the diagnosis and treatment of breast cancer. Our study aimed to explore the clinical research implementation capabilities of breast cancer treatment departments in China and to analyze the differences among regions, departments and different hospital classifications. Methods: This was a department-based cross-sectional study conducted in the form of electronic questionnaires in China from 7th August to 31st August 2023; this study was initiated by the breast cancer expert committee of the National Cancer Center (NCC). The questionnaire was designed on the Wenjuanxing platform. Our study was conducted among the first batch of breast cancer standardized diagnosis and treatment quality control pilot centers, which includes 200 hospitals selected by the NCC on the basis of the level of breast cancer diagnosis and treatment, surgery volume and other factors. The centers cover 30 provinces, and all of them are tertiary-level general hospitals or cancer hospitals. Results: A total of 127 questionnaires from 122 hospitals were ultimately included in the analysis. Medical personnel involved in the clinical research of 118 (92.9%) departments received good clinical practice (GCP) training. A total of 89.3% (109/122) underwent centralized institutional review board (IRB) review. The steps of the approval process from research initiation to completion lasted 2-4 weeks or longer. The majority of departments initiated or participated in 2 or fewer clinical research projects over the past year. Among the differences between different departments, the Department of Medical Oncology had a better qualification profile and process and greater number of initiated and participated clinical studies than did the Department of Surgical Oncology. There were more patients enrolled in registered clinical trials in specialized cancer hospitals than in general hospitals (50 and below, 50-200, and more than 200 patients from specialized cancer hospitals vs. general hospitals: 39.1%, 52.2%, and 8.7% vs. 76.9%, 16.4%, and 6.7%, respectively; p = 0.001). For needs and problems, most of the departments were strongly willing to undertake clinical research and receive professional training; the most common problem in the process of conducting studies was patient recruitment. Conclusions: Most departments generally exhibited complete capabilities for implementing clinical research. Improvements in implementation efficiency, quality and quantity of research and patient recruitment are still needed. Professional training and communication, as well as the recommendation and implementation of clinical research, are required in future development.