Background: Sentinel lymph node biopsy (SLNB) was introduced over 30 years ago, but the application of SLNB in China is unclear. This study aimed to explore the real-world implementation of SLNB among early-stage breast cancer patients in China.
Methods: A multi-center, retrospective study was conducted among primary breast cancer patients from 37 hospitals in China in 2018. Their clinical data were collected and analyzed, including the implementation status of SLNB in China, subsequent processing of sentinel lymph nodes (SLNs) containing metastases, and the effect of neoadjuvant chemotherapy (NAC) on SLNB.
Results: SLNB surgery was performed on 43.5% of early-stage breast cancer patients in China and 11,942 patients who underwent SLNB were enrolled in this study. The majority of SLNBs were performed using a single mapping agent. A combination of blue dye and radiotracer or fluorescence imaging was used in only 14.9% of patients. The mean (SD) number of resected SLNs was 4.0 (2.1). For the patients with 1 or 2 positive SLNs, 83.0% of them continued to receive axillary lymph node dissection (ALND), while others did not. For the patients with three or more positive SLNs, 97.2% of them continued to receive ALND, among which 82.9% accepted radiotherapy simultaneously. Of the patients who underwent SLN surgery, 5.5% (654/11,942) were receiving NAC. Among them, 51.9% received SLNB before NAC, and the rest received SLNB after NAC. In biopsy-proven positive nodes, 64.7% positive SLNs turned negative after NAC.
Conclusion: SLNB has been promoted in China, but it is not widely used compared to in developed countries. Furthermore, the usage of the dual tracer technique in SLNB is not high. Chinese breast surgeons are more conservative regarding the omission of ALND in 1 or 2 SLNs-positive patients.
Keywords: sentinel lymph node, early-stage breast cancer, real word data