[Sentinel lymph node detection in patients with breast carcinoma]

Area of Science:

• Oncology
• Nuclear Medicine
• Surgical Pathology

Background:

• Sentinel lymph node biopsy is a crucial technique for staging cancer by identifying the primary metastatic site.
• Accurate staging of breast cancer is essential for determining appropriate treatment and prognosis.
• Axillary lymph node dissection is a standard procedure but can lead to significant morbidity.

Purpose of the Study:

• To evaluate the efficacy of sentinel node detection in breast cancer patients.
• To correlate sentinel node biopsy findings with the status of all axillary lymph nodes.
• To assess the utility of sentinel node biopsy for individualizing axillary dissection based on tumor stage.

Main Methods:

• Analysis of 123 breast cancer patients undergoing sentinel node detection.
• Preoperative lymphoscintigraphy using 99mTC-Nanokoll 17 hours post-injection.
• Identification of the sentinel node using a gammaprobe.
• Histological examination of the sentinel node and all other axillary nodes.

Main Results:

• Sentinel node identification was successful in 75/89 patients with pT1-2 tumors and 11/17 patients with pT3-4 tumors.
• High accuracy (96%) in correlating sentinel node findings with overall axillary node status for pT1-2 tumors.
• Limited predictability of lymph node status in patients with advanced (pT3-4) tumors.

Conclusions:

• Sentinel node biopsy is a highly accurate tool for staging breast cancer, especially in early stages (pT1-2).
• The technique allows for the precise identification of the most relevant lymph node for metastasis.
• Sentinel node biopsy can help individualize axillary dissection, potentially reducing overtreatment in select breast cancer patients.