Women with left-sided breast cancer undergo hypofractionated RT at either free-breathing or deep inspiration breath-hold. The incidence and potential clinical, dosimetric and biological indicators of early clinical or subclinical cardiac injury are investigate at 2 years.
Postoperative breast radiotherapy (RT) has been associated with increased risk of heart toxicity. However, there is a lack of knowledge for radiation-induced early cardiovascular injury, especially for hypofractionated RT. This study aims to prospectively detect and predict early clinical or subclinical cardiac events in women undergoing adjuvant RT for breast cancer.