SLNB has been recommended by domestic and foreign guidelines for patients with initial cN1 and NAC descending to ycN0. However, the best technical path is still not very clear at present, and the long-term tumor safety data is still insufficient. Therefore, it is necessary to further explore the optimal technical pathway and long-term tumor safety for SLNB in patients with initial cN1 and NAC downgrading to ycN0 in the real world.This study will evaluate the optimized technical pathway and long-term tumor safety of SLNB in patients with initial cN1 and NAC downgrading to ycN0 in real-world studies.
Patients With ECOG Score 0-1 Points
Patients With Breast Cancer Stage cT1-3N1M0 (According to AJCC Version 7) Pathological Diagnosis of Ipsilateral Axillary Lymph Node Metastasis in Patients With Invasive Breast Cancer
Patients With Abnormal Axillary Lymph Nodes ≤ 3 Detected by Imaging Examination
Patients With Effective Neoadjuvant Therapy (CR+PR)
Stage IV (metastatic) breast cancer；
Simultaneous double breast cancer；
Baseline cT4;
Baseline cN2-3