Background:                                                       For patients with breast cancer, axillary dissection was a standard treatment, especially with positive metastases in the sentinel nodes. For some patients axillary dissection might be over-treatment, including those who have had a mastectomy. Especially with the new trend of many radiation-therapy centers, provide radiation-therapy for any number of positive lymph nodes. The aim of our work is to evaluate the impact of number of dissected axillary lymph nodes (LN), on overall survival OS and progression free survival in breast cancer patients

 Methods:                                                       this is a retrospective