Long-Term Outcomes Using Electron IOERT APBI for Early Stage Breast Cancer: The Verona University Hospital Experience.

Methods and Materials: From July 2006 to December 2015, 295 patients suitable for breast-conserving therapy entered a single-arm phase II study and were treated with IOERT as radical treatment. Inclusion criteria were age >50, postmenopausal status, cT1N0M0 stage, grade G1-G2, positive estrogen receptor status; unicentric and unifocal disease, histologically proven invasive ductal carcinoma no previous breast irradiation, good performance status.
Results: With a median follow-up of 7.1 years (95% CI, 6.5;7.4) 6 women (2.0%) experienced a true local recurrence (reappearance of the tumour in the same quadrant). Five-year overall survival and local recurrence-free survival were 96% (95% CI, 92.9;97.8) and 94.9% (95% CI, 91.6;97.0) respectively.
Conclusion: Our trial suggests that, in highly selected early stage breast cancers, a single-dose IOERT can be safely delivered with excellent results and very low long-term recurrence rates.
Competing Interests: Disclosure The authors declare no conflict of interest.
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