Repeat Lumpectomy for Ipsilateral Breast Tumor Recurrence after Breast-Conserving Treatment

OBJECTIVES: There are limited data on the outcomes of patients treated with repeat lumpectomy at the time of ipsilateral breast tumor recurrence (IBTR). METHODS: We retrospectively analyzed 78 patients who underwent repeat lumpectomy after IBTR. The risk factors for second IBTR were assessed. RESULTS: The median follow-up period was 40 months. The 5-year second IBTR-free survival rate was 78.8%. Patients with estrogen receptor (ER)-positive or unknown tumors at IBTR had a significantly better second IBTR-free survival rate than those with ER-negative tumors at IBTR (88.3 vs. 55.4%, respectively; p = 0.0022). Multivariate analysis revealed that the ER status of IBTR was a significantly independent predictive factor for second IBTR-free survival (p = 0.0177). The low-risk group for second IBTR was detected using the ER status, disease-free interval, margin status of IBTR, and age at diagnosis (5-year cumulative incidence, 7.0%). CONCLUSION: The ER status of IBTR was a significantly independent predictive factor for second IBTR-free survival. Some patients could safely undergo repeat lumpectomy for IBTR.