To Evaluate the Efficacy and Safety of Ipsilateral Supraclavicular Lymph Node Dissection for Breast Cancer Patients

For newly diagnosed ISLNM breast cancer, on the basis of effective treatment of the new auxiliary system, the optimal local treatment of the supraclavicular region remains controversial. Although guidelines such as NCCN recommend simple clavicular radiation therapy, there are studies suggesting that supraclavicular lymph node dissection can improve prognosis, and many hospitals in China are still accustomed to performing supraclavicular lymph node dissection. Therefore, ipsilateral supraclavicular lymph node dissection is the first time to diagnose ipsilateral supraclavicular lymph node metastasis of breast cancer. The effectiveness and safety of (stage IIIc) treatment still require prospective research to confirm.This project is a prospective, multicenter, non-interference real world study. In the real world study, the investigators evaluated the efficacy and safety of ipsilateral supraclavicular lymph node dissection in the treatment of initially diagnosed ipsilateral supraclavicular lymph node metastasis breast cancer patients. The main endpoint of the study was recurrence free survival on the ipsilateral clavicle. The secondary study endpoint is disease-free survival; Ipsilateral supraclavicular relapse-free survival; Rregional lymph node relapse-free survival; Overall survival; Security; The incidence of upper limb lymphedema; Patient's quality of life.