Myocardial functional and structural abnormalities after adjuvant radiotherapy for breast cancer. Relation to cardiac radiation exposure

Autor: B. Gerber, P Krug, C Kirkove, B Ledoux, Christophe Beauloye, Martine Berlière, David Vancraeynest, Agnes Pasquet, A.C. Pouleur, X Geets
Rok vydání: 2021
Předmět:
Zdroj: European Heart Journal - Cardiovascular Imaging. 22
ISSN: 2047-2412
2047-2404
DOI: 10.1093/ehjci/jeab090.129
Popis: Funding Acknowledgements Type of funding sources: Foundation. Main funding source(s): The Funds Pierre Masure, Alphonse and Marie Walckiers & De Winter-Vermant, by King Baudouin Foundation Background Radiation therapy (RXT) is a keystone in breast cancer (BC) treatment which allows to reduce risk of local recurrence and cancer related mortality. Yet these benefits may be offset by increases in cardiovascular mortality due to late radiation induced cardiotoxicity. Indeed, prior works in patients exposed to high cardiac radiation dose demonstrated development of diffuse and focal myocardial fibrosis by cMR. However, whether such effects may also occur after contemporary BC-RXT with lower cardiac dose exposure, has not yet been evaluated. Purpose To evaluate the long-term cardiac safety of contemporary RXT for BC, we sought to estimate the prevalence of cardiac functional and structural focal and myocardial abnormalities in BC survivors treated by RXT 10 years earlier, in direct relation to measured local radiation dose exposure. Methods In a prospective cross-sectional study, we studied 27 women (mean age 62 ± 7 years) treated with adjuvant RXT but without chemotherapy for a first left (n= 12) or right sided (n= 15) BC between 2009 and 2011, which had no history of coronary artery or cardiac disease and compared them to 20 age matched (64 ± 10 years) healthy female controls (without history of BC or RXT). All subjects underwent 3T cMR to measure LV volumes, function, global longitudinal (GLS), circumferential (GRS) and radial strains (GRS) as well as extracellular volume (ECV) and late gadolinium enhancement (LGE). Functional and structural abnormalities in women with BC were compared to healthy controls. We also compared abnormalities among patients with left vs right BC and related them to mean heart radiation dose measured at the time of RXT (Figure). Results Mean cardiac radiation exposure in BC survivors was 1.87 ± 1.7 Gy (range 0-7.9 Gy). Exposure was significantly (p Conclusions In this preliminary work, patients with BC treated by adjuvant RXT 10 years ago, presented no significant structural or functional abnormalities in relation to cardiac dose exposure nor in comparison to healthy controls. This suggests that current RXT protocols for BC are safe without long-term functional or morphological cardiac side effects.
Databáze: OpenAIRE
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