What question did this study set out to answer?

To investigate local recurrence rates and prognosis following breast-conserving surgery in Japan using recent real-world data.

Abstract PS5-05-22: A Multicenter Retrospective Cohrt Study on Long-Term Outcomes after Partial Mastectomy in Japan

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Multicenter retrospective study investigates local recurrence and prognosis after breast-conserving surgery in Japan, suggesting improved outcomes.

To investigate local recurrence rates and prognosis following breast-conserving surgery in Japan using recent real-world data.
Data collected from 8,897 breast cancer patients who underwent breast-conserving surgery from 2014 to 2018 at 25 institutions in Japan.
Analyzed risk factors for local recurrence based on demographics and clinical characteristics.
Utilized Kaplan-Meier analysis to estimate local recurrence rate, disease-free survival, and overall survival.
Median follow-up was 6.6 years with a 5-year local recurrence rate of 2.0%.
10-year overall survival was 94.1%, with a 10-year disease-free survival rate of 86.2%.
Younger age, tumor size, high Ki-67, and lack of adjuvant therapy were identified as potential risk factors for local recurrence.

Kutomi et al. (2026) studied this question.

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Multicenter retrospective study investigates local recurrence and prognosis after breast-conserving surgery in Japan, suggesting improved outcomes.