Li Hongyuan, Doctor of Surgery, master's tutor, chief physician, director of Endocrinology and Breast Surgery Department (Chongqing Breast Cancer Center) of the First Affiliated Hospital of Chongqing Medical University.Standing member and secretary general of the Breast Cancer Professional Committee of the China Anti-Cancer Association, standing member and secretary general of the Breast Surgery Committee of the Surgeons Branch of the Chinese Medical Doctor Association, chairman of the Breast Cancer Professional Committee of the Chongqing Anti-Cancer Association, and chairman of the Breast Surgery Special Committee of the Chongqing Medical Doctor Association.Has been engaged in medical, teaching and scientific research in general surgery for more than 20 years; has rich clinical experience in the diagnosis and treatment of various diseases in general surgery, especially in the diagnosis and treatment of breast, thyroid and pancreatic diseases.From November 2002 to May 2004, the breast surgery department of Louis-Pasteur University of Strasbourg, France, early diagnosis of breast cancer, breast radical surgery, breast reconstruction surgery, sentinel lymph node biopsy technology and chemotherapy for breast cancer, with a high clinical theory and practice level in this field.He has published more than 110 papers, participated in 5 monographs on breast diseases, and won the Chongqing Science and Technology Progress Award and one Medical Science Award of Chongqing Health Bureau.