Impact of atypical hyperplasia at margins of breast-conserving surgery on the recurrence of breast cancer.

Purpose Atypical hyperplasia (AH) is associated with a relatively higher risk of subsequent development of cancer. It remains controversial whether it is necessary to re-excise AH found at surgical margins during breast-conserving surgery (BCS). The aim of this study was to determine the impact of atypical ductal/lobular hyperplasia found at the margins during BCS on the prognosis of early-stage breast cancer patients.