Clinical significance following breast conservation therapy with or without irradiation in breast cancer patients

Kentaro Tamaki, Nobumitsu Tamaki, Yoshihiko Kamada, Kanou Uehara, Noriaki Ohuchi, Minoru Miyashita, Takanori Ishida, Hironobu Sasano

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Background: We retrospectively examined the clinical outcome of irradiated versus non-irradiated groups of Japanese breast cancer patients according to their clinical and histopathological characteristics following breast-conserving therapy. Methods: We retrospectively evaluated a total of 1197 Japanese female breast cancer patients (598 irradiated and 599 non-irradiated) who received breast-conserving therapy. The median age of the patients was 54 years (range: 24-99 years). We retrospectively examined the local recurrence-free survival rates in those with or without post-operative irradiation according to age, surgical margin status and histopathological characteristics including histological grade, estrogen receptor expression and HER2 status. Results: Local recurrence-free survival rates in the irradiated group were significantly higher than those in the non-irradiated group, especially in surgical margin-positive [hazard ratio (HR): 0.334, 95% confidence interval: 0.14-0.79, P = 0.001], estrogen receptor-positive (HR: 0.249, 95% confidence interval: 0.11-0.54, P < 0.001), HER2-negative (HR: 0.382, 95% confidence interval: 0.21-0.69, P = 0.001) and non-triple-negative (HR: 0.382, 95% confidence interval: 0.21-0.69, P = 0.001) breast cancer patients. Conclusion: The results indicated that irradiation after breast-conserving therapy is strongly recommended in Japanese breast cancer patients, especially those with surgically positive margins, estrogen receptor-positive tumors and HER2-negative invasive breast cancers.

Original languageEnglish
Pages (from-to)251-257
Number of pages7
JournalJapanese journal of clinical oncology
Issue number3
Publication statusPublished - 2013 Mar


  • Breast cancer
  • Conservation therapy
  • ER
  • HER2
  • Radiotherapy

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research


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