Diagnosis and treatment of breast phyllodes tumors XUAN Li-xue, BI Xiao-feng. Breast Disease Center, Cancer Hospital of Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021, China Abstract Phyllodes tumors ,which are defined as fibroepithelital of breast tumours， are uncommon,and they are difficult to predict biologic behavior based on clinicopathologic features. The diagnosis and classification of phyllodes tumors of the breast rely mainly on histopathological examination, core needle aspiration biopsy is the best diagnostic method,The different surgical operation should be performed according to the different classification. Breat surgery with clear margin is the current treatment of choice for phyllodes tumours.The ues of adjuvant chemotherapy、radiation therapy and endocrine therapy appears to be increasing in recent years, but its efficacy is debatable.