Adequate histologic sampling of breast core needle biopsies

Area of Science:

• Pathology
• Oncology
• Histology

Background:

• Accurate diagnosis of breast lesions from core needle biopsies (CNB) is crucial for patient management.
• Atypical lesions, such as atypical ductal hyperplasia (ADH) and atypical small acinar proliferation (ASAP), require careful evaluation to distinguish them from malignancy.

Purpose of the Study:

• To determine the optimal number of histologic sections from breast CNB specimens needed for adequate detection of ADH and ASAP.
• To correlate findings from CNB with subsequent excisional biopsy results.

Main Methods:

• A retrospective review of 3026 breast CNB cases (11 and 14 gauge) diagnosed with ADH or ASAP over 50 months.
• All biopsy blocks were sectioned into 8 slides to assess the detection rate of these lesions at different levels.
• Results were compared with findings from subsequent excisional biopsies.

Main Results:

• Of 216 cases with atypical diagnoses, 105 had subsequent resections. 95% were confirmed as ADH, and 2 as ASAP.
• ASAP lesions were first detected on the second and fourth slides.
• ADH lesions were detected across the first five slides, with 43% on the first, 17% on the second, 23% on the third, and 16% on the fourth and fifth slides.
• No atypical lesions were initially detected beyond the fifth slide.

Conclusions:

• A minimum of five histologic sections from breast CNB specimens is recommended to ensure comprehensive sampling of ADH and ASAP.
• Adequate sampling is essential to minimize the risk of underdiagnosis and ensure appropriate patient care.