Evolution in sentinel lymph node biopsy in breast cancer.

Area of Science:

• Oncology
• Surgical Oncology
• Breast Cancer Research

Background:

• Sentinel lymph node biopsy (SLNB) is the standard for axillary staging in clinically node-negative (cN0) breast cancer patients without neoadjuvant chemotherapy (NAC).
• The utility of SLNB in patients undergoing NAC has been investigated, with evidence supporting its application in pretreatment cN0 cases.
• However, routine use in all initially node-positive patients who achieve cN0 status post-NAC is not recommended due to a high false-negative rate.

Purpose of the Study:

• To review the advancements and current status of sentinel lymph node biopsy (SLNB) in breast cancer management.
• To evaluate the efficacy and limitations of SLNB in various clinical scenarios, including post-neoadjuvant chemotherapy.
• To discuss novel techniques for SLN detection and their accuracy in early breast cancer.

Main Methods:

• Review of existing literature and clinical evidence on sentinel lymph node biopsy (SLNB) in breast cancer.
• Analysis of the application and outcomes of SLNB in patients with and without neoadjuvant chemotherapy (NAC).
• Examination of novel techniques for sentinel lymph node (SLN) detection and their performance.

Main Results:

• SLNB is effective for axillary staging in cN0 breast cancer patients without NAC.
• Evidence supports SLNB use after NAC in patients who were cN0 pretreatment.
• Routine SLNB in all node-positive patients who convert to cN0 after NAC is not justified due to high false-negative rates, though improvements are possible in subsets.
• Novel SLN detection techniques show high accuracy in early breast cancer.

Conclusions:

• Sentinel lymph node biopsy (SLNB) remains a crucial tool for axillary staging in breast cancer.
• Careful patient selection is necessary when considering SLNB after neoadjuvant chemotherapy (NAC), particularly for initially node-positive patients.
• Advancements in SLN detection methods offer improved accuracy and potential for broader application in breast cancer staging.