Surgical margins after needle-localization breast biopsy

Area of Science:

• Oncology
• Surgical Pathology
• Radiology

Background:

• Needle-localization breast biopsy (NLBB) is a common method for early breast cancer diagnosis.
• The adequacy of achieving tumor-free margins after NLBB and its impact on residual disease is not well-established.
• This study investigates the relationship between margin status post-NLBB and the presence of residual invasive carcinoma upon reexcision.

Purpose of the Study:

• To determine if the margin status after needle-localization breast biopsy (NLBB) influences the likelihood of residual invasive breast carcinoma.
• To evaluate the necessity of reexcision for invasive breast neoplasia diagnosed via NLBB, irrespective of initial margin status.

Main Methods:

• Retrospective cohort analysis of 890 NLBB procedures performed between January 1990 and June 1994.
• Patients with invasive breast neoplasia were categorized into two groups: positive margins (Group 1) and negative margins (Group 2) post-NLBB.
• Review of breast specimens after reexcision (mastectomy, tylectomy, or quadrantectomy) for residual invasive carcinoma.

Main Results:

• Invasive breast neoplasia was identified in 12% (107/890) of patients.
• Reexcision was performed in all patients with positive margins (45/45) and 75% of those with negative margins (38/51).
• Residual invasive carcinoma was found in 22% of patients with positive margins and 8% with negative margins, a difference not statistically significant (P=0.13).

Conclusions:

• Invasive breast neoplasia diagnosed by NLBB necessitates reexcision to ensure complete local surgical eradication.
• The margin status immediately following NLBB does not reliably predict the presence of residual invasive carcinoma.
• Reexcision is recommended for all cases of invasive breast cancer diagnosed via NLBB, regardless of the initial margin status.