Blue-dye technique complements four-node sampling for early breast cancer.

Area of Science:

• Oncology
• Surgical Pathology
• Diagnostic Imaging

Background:

• Sentinel lymph node biopsy (SNB) is crucial for breast cancer staging.
• Accurate identification of sentinel lymph nodes (SNs) minimizes unnecessary axillary dissection.
• Blue dye techniques offer a radio-isotope-free alternative for SNB.

Purpose of the Study:

• To evaluate the efficacy of the four-node axillary sampling with blue dye (4NAS/dye) technique as a sentinel node biopsy for breast cancer.
• To assess the feasibility and accuracy of 4NAS/dye in identifying SNs.
• To determine if 4NAS/dye can replace traditional SNB methods, avoiding axillary lymph node dissection.

Main Methods:

• Lymphatic mapping was performed using patent blue dye in consecutive breast cancer cases.
• Axillary sampling aimed to retrieve four nodes, followed by back-up axillary lymph node dissection for feasibility assessment.
• The 4NAS/dye method was validated in two independent studies and then applied to 101 clinically node-negative patients with intraoperative frozen section diagnosis.

Main Results:

• The 4NAS/dye technique achieved a 97.0% identification rate for sentinel lymph nodes (SNs) when combined with blue dye.
• Nodal status was predicted with 100% accuracy using 4NAS/dye in cases with metastasis.
• In a subsequent study, 4NAS/dye successfully detected SNs in 100 of 101 patients with acceptable post-operative morbidity.

Conclusions:

• The four-node axillary sampling with blue dye (4NAS/dye) is a reliable and effective method for sentinel lymph node detection in breast cancer.
• This technique offers a viable radio-isotope-free alternative for SNB, suitable for observational studies.
• 4NAS/dye successfully avoids the need for extensive axillary lymph node dissection in clinically node-negative breast cancer patients.