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Erschienen in:

28.03.2017 | Epidemiology

Self-reported long-term cardiac morbidity in breast cancer patients: a retrospective cohort study in Germany (PASSOS Heart Study)

verfasst von: Daniel Wollschläger, Hiltrud Merzenich, Lukas Schwentner, Wolfgang Janni, Thomas Wiegel, Detlef Bartkowiak, Achim Wöckel, Marcus Schmidt, Heinz Schmidberger, Maria Blettner

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 3/2017

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Abstract

Purpose

Improved survival after locoregional breast cancer has increased the concern about late adverse effects after therapy. In particular, radiotherapy was identified as a risk factor for major cardiac events in women treated until the 1990s. While modern radiotherapy with computerized planning based on 3D-imaging can help spare organs at risk, heart exposure may remain substantial. In a retrospective cohort study of women treated for locoregional breast cancer, we investigated whether current radiotherapy is associated with an elevated long-term cardiac morbidity risk.

Methods

The study included 11,982 women diagnosed with breast cancer in Germany in 1998–2008. After an individual mortality follow-up, 9338 questionnaires on cardiac events before or after therapy and on associated risk factors were sent out in 2014. Based on 4434 questionnaires from women with radiotherapy, we used Cox regression to analyze the association between self-reported cardiac morbidity and breast cancer laterality as a surrogate measure of radiation exposure.

Results

After a median follow-up of 8.3 years, there was no significant association of tumor laterality with cardiac morbidity in irradiated patients (458 events, hazard ratio for left-sided vs. right-sided tumors 1.07, 95% CI 0.89–1.29). Significant risk factors for any cardiac event included age at diagnosis, chemotherapy, hypertension, hypercholesteremia, and chronic kidney disease.

Conclusions

For contemporary radiotherapy, we found no evidence for a significantly elevated cardiac morbidity risk in left-sided versus right-sided breast cancer. Possible reasons for failing to confirm earlier reports on increased risk include shorter follow-up, application of newer radiotherapy techniques, and improved health monitoring.

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Titel: Self-reported long-term cardiac morbidity in breast cancer patients: a retrospective cohort study in Germany (PASSOS Heart Study)
verfasst von: Daniel Wollschläger
Hiltrud Merzenich
Lukas Schwentner
Wolfgang Janni
Thomas Wiegel
Detlef Bartkowiak
Achim Wöckel
Marcus Schmidt
Heinz Schmidberger
Maria Blettner
Publikationsdatum: 28.03.2017
Verlag: Springer US
Erschienen in: Breast Cancer Research and Treatment / Ausgabe 3/2017
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-017-4215-7

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Self-reported long-term cardiac morbidity in breast cancer patients: a retrospective cohort study in Germany (PASSOS Heart Study)