Scientific Presentation Award: The combination of axillary ultrasound and ultrasound-guided biopsy is an accurate predictor of axillary stage in clinically node-negative breast cancer patients

Background The study aim was to determine the accuracy of axillary ultrasound (AUS) and fine-needle aspiration biopsy (FNAB)/needle core biopsy in axillary breast cancer staging. Methods We reviewed 256 patients with clinically node-negative breast cancer who underwent AUS ± FNAB/needle core biopsy. AUS-guided FNAB/needle core biopsy was compared with histopathology to determine sensitivity, specificity, negative predictive value, and positive predictive value. Results AUS-guided FNAB/needle core biopsy and final pathology were positive in 72 of 256 patients (28%). In 125 of 256 cases (49%), the AUS and final pathology were negative. Two of 110 patients had a false-positive FNAB (1.8%); both received neoadjuvant chemotherapy. Nine patients (8%) had a false-negative FNAB/needle core biopsy; the median size of lymph node metastasis was 3 mm. The sensitivity and specificity of AUS-guided FNAB/needle core biopsy was 71% and 99%, respectively, with a negative predictive value of 84% and a positive predictive value of 97%. Conclusions AUS-guided FNAB/needle core biopsy is accurate in predicting the status of the axilla in 70% of clinically node-negative breast cancer patients. This technique is minimally invasive with a low complication rate and can obviate the need for staged lymph node procedures.