Optimal radiation dose for patients with one to three lymph node positive breast cancer following breast-conserving surgery and anthracycline plus taxane-based chemotherapy: A retrospective multicenter analysis (KROG 1418)

Haeyoung Kim, Won Park, Jeong Il Yu, Doo Ho Choi, Seung Jae Huh, Yeon Joo Kim, Eun Sook Lee, Keun Seok Lee, Han Sung Kang, In Hae Park, Kyung Hwan Shin, Kyubo Kim, Kyung Ran Park, Yong Bae Kim, Sung Ja Ahn, Jong Hoon Lee, Jin Hee Kim, Mison Chun, Hyung Sik Lee, Jung Soo KimJong Young Lee

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Abstract

Background and Purpose: This study was performed to determine optimal radiation dose in pN1 breast cancer patients who received breast conserving surgery (BCS) and anthracycline plus taxane (AT)-based chemotherapy. Materials and Methods: Retrospective chart reviews were performed in 1,147 patients who were treated between January 2006 and December 2010. The impact of radiation dose on treatment outcomes was evaluated. Results: Median follow-up time was 66 months. The 5-year rate of disease-free survival (DFS) was 93.2%. Larger tumor size (> 20 mm), positive lymphovascular invasion, high histologic grade, and high ratio of positive nodes (> 0.1) were significantly associated with inferior DFS. By using the 4 factors related to DFS, patients were categorized into high-risk (with ≥ 3 factors) and low-risk (with < 3 factors) groups. In the high-risk group, higher radiation dose (> 60.3 GyEQD2) was significantly associated with better DFS than the lower dose (≤ 60.3 GyEQD2). However, the radiation dose did not impact DFS in the low-risk group. Conclusions: Dosing of radiation affects the outcome of post-BCS radiotherapy in pN1 breast cancer. Doses of over 60.3 GyEQD23 were associated with better outcome in the high-risk patients.

Original languageEnglish
Pages (from-to)1796-1804
Number of pages9
JournalOncotarget
Volume8
Issue number1
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Oncology

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    Kim, H., Park, W., Yu, J. I., Choi, D. H., Huh, S. J., Kim, Y. J., Lee, E. S., Lee, K. S., Kang, H. S., Park, I. H., Shin, K. H., Kim, K., Park, K. R., Kim, Y. B., Ahn, S. J., Lee, J. H., Kim, J. H., Chun, M., Lee, H. S., ... Lee, J. Y. (2017). Optimal radiation dose for patients with one to three lymph node positive breast cancer following breast-conserving surgery and anthracycline plus taxane-based chemotherapy: A retrospective multicenter analysis (KROG 1418). Oncotarget, 8(1), 1796-1804. https://doi.org/10.18632/oncotarget.12882