Axillary metastasis in clinically node-negative breast cancer

Area of Science:

• Oncology
• Surgical Pathology

Background:

• Sentinel lymph node biopsy (SLN) is crucial for staging early-stage breast cancer.
• Accurate detection of axillary metastasis in SLN is vital for treatment planning.
• Factors influencing metastasis in clinically node-negative patients require further investigation.

Purpose of the Study:

• To identify factors associated with metastasis detection in sentinel lymph node biopsies.
• To evaluate the significance of lymphovascular invasion and other clinicopathological features in SLN metastasis.
• To determine predictors of axillary metastasis in early-stage breast cancer patients without clinical axillary involvement.

Main Methods:

• Retrospective analysis of medical records from 64 early-stage breast cancer patients undergoing SLN biopsy.
• Patients were divided into two groups: positive (Group I) and negative (Group II) for axillary metastasis on SLN biopsy.
• Statistical analysis including univariate and multivariate analyses was performed to identify significant factors.

Main Results:

• Lymphovascular invasion was significantly more frequent in patients with positive SLN metastasis (57%) compared to those without (13%) (p=0.003).
• Progesterone receptor status, tumor T-stage, and Ki-67 index showed significant differences between groups.
• Multivariate analysis confirmed lymphovascular invasion as the sole significant predictor of axillary metastasis.

Conclusions:

• Lymphovascular invasion is a significant independent predictor of axillary metastasis in sentinel lymph node biopsies.
• SLN biopsy findings, particularly lymphovascular invasion, are critical for accurate staging in early-stage breast cancer.
• This study highlights the importance of evaluating lymphovascular invasion for metastasis detection in SLN biopsies.