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Radiation-related heart disease after breast cancer radiation therapy in Korean women

  • Epidemiology
  • Published:
Breast Cancer Research and Treatment Aims and scope Submit manuscript

Abstract

Purpose

To study the late cardiac toxicity of breast radiation therapy (RT) in Asian women.

Methods

Female breast cancer patients in Korea who underwent breast conservation surgery followed by RT from 1990–2012 were identified from two large registries at institution and population levels. Cumulative incidences of acute coronary events (ACE) or cardiac mortality were estimated in relation to the laterality of breast cancer using a competing risks analysis.

Results

In an analysis of 2577 women from a single institution, 3.7% were obese (body mass index ≥30), and 3.4% were ever-smokers. Patients with a history of hypertension, diabetes, or coronary artery disease were 17.5, 5.7, and 2.8%, respectively. The mean heart doses were 6.2 and 1.5 Gy for left- and right-sided tumors, respectively. With a median follow-up of 7 (range 1–23) years, the overall and breast cancer-specific survivals at 10 years were 94.9 and 96.5%, respectively. The 10-year cumulative incidence of ACE was 2.96%. The mean time to ACE was 5.2 ± 3.9 years (range 1–17). There was no clinically relevant difference in rates of ACE between left-sided and right-sided patients, with an adjusted hazard ratio of 1.16 (CI 0.59–2.29). An analysis of 24,235 women in a nationwide registry validated these negative findings with respect to cardiac mortality, with an adjusted hazard ratio of 1.52 (CI 0.37–6.25). Increasing age, a higher body mass index, and a history of hypertension or ischemic heart disease were identified as risk factors.

Conclusions

Our findings reassure that excess risk from breast RT may be small in healthy women, most of who not smoke, weigh less, and have fewer risk factors. A validation using a larger data set of National Health Insurance Corporation is ongoing.

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Acknowledgements

This article was supported by the Korean Breast Cancer Society.

Author information

Authors and Affiliations

  1. Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University College of Medicine, 50-1, Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea

    Jee Suk Chang, Kyung Hwan Kim, Chang-Ok Suh & Yong Bae Kim

  2. Department of Surgery, Ulsan University Hospital, Ulsan University College of Medicine, Ulsan, South Korea

    Byung Kyun Ko

  3. Department of Breast and Endocrine Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, South Korea

    Jeoung Won Bae

  4. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea

    Jong-Han Yu

  5. Department of Surgery, Chonnam National University Medical School, Gwangju, South Korea

    Min Ho Park

  6. Department of Surgery, School of Medicine, Ajou University, Suwon, South Korea

    Yongsik Jung

  7. Department of Surgery, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea

    Ye Won Jeon

  8. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, South Korea

    Jaeyong Shin

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  1. Jee Suk Chang
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Korean Breast Cancer Society

Corresponding author

Correspondence to Yong Bae Kim.

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Chang, J.S., Ko, B.K., Bae, J.W. et al. Radiation-related heart disease after breast cancer radiation therapy in Korean women. Breast Cancer Res Treat 166, 249–257 (2017). https://doi.org/10.1007/s10549-017-4398-y

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  • DOI: https://doi.org/10.1007/s10549-017-4398-y

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