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Purpose: The aim of the study was to evaluate the existence of a learning curve for procedures using ultrasound-guided vacuum-assisted breast biopsy (VAB) system in terms of the cumulative sum (CUSUM). Methods: Data from a series of 54 consecutive patients who had undergone ultrasound-guided VAB were reviewed in the study. Patients’ characteristics, operative times, and complication rates were analyzed. The total operation time was analyzed by using the CUSUM method. Results: CUSUM analysis revealed three phases of the learning curve: phase 1 (the initial 15 cases), phase 2 (intermediate 23 cases), and phase 3 (subsequent cases). Operative times, including preparation time, procedure time, and total operation time, in phase 1 were significantly longer than those in phases 2 and 3. Surgical complications were the most frequent in the initial phase (26.7%); however, complication rates were not significantly different among the three groups. Conclusion: The current study showed the three different phases of the learning curve for ultrasound-guided VAB using CUSUM analysis. CUSUM analysis can be used to determine appropriate competency of various procedures in patients with breast diseases.

Cumulative Sum Analysis for Learning Curve for Breast Mass Excision Using an Ultrasound-Guided Vacuum-Assisted Biopsy System