Re-excision operations in nonpalpable breast cancer

Area of Science:

• Breast imaging and pathology
• Surgical oncology
• Diagnostic procedures

Background:

• Needle-localization (NL) biopsies are crucial for diagnosing nonpalpable breast lesions.
• Positive microscopic margins after biopsy can indicate residual cancer, potentially requiring further surgery.
• Optimizing diagnostic and surgical pathways is essential for effective breast cancer management.

Purpose of the Study:

• To evaluate the incidence of residual disease in patients with positive microscopic margins following NL biopsies.
• To assess the effectiveness of re-excision in managing residual cancer.
• To determine the potential benefit of preoperative fine-needle aspiration cytology.

Main Methods:

• Retrospective review of 317 NL biopsies performed between 1989 and 1992.
• Analysis of histopathological findings, margin status, and re-excision outcomes.
• Correlation of margin status with residual tumor presence.

Main Results:

• Malignancy yield was 48%, with a benign to malignant ratio of 1:1:1.
• 45% of malignant lesions had positive microscopic margins.
• 56% of re-excisions for positive margins contained residual tumor, including invasive carcinoma and DCIS.

Conclusions:

• Positive microscopic margins in NL-detected nonpalpable cancers are associated with a significant incidence of residual disease.
• Wider re-excision for positive margins is a justified surgical approach.
• Preoperative stereotactic fine-needle aspiration cytology could help guide initial definitive treatment and potentially avoid repeat procedures.