Cardiotoxicity perspective on the concurrent use of anti-HER2 agents and hypofractionated versus conventional fractionated locoregional radiotherapy in breast cancer. - Tepetam H; Varan MP; Alomarı O; Yıldırım S; Gedik D; Odabaş H; Yaprak G; Taşlıyurt Ö; Gül ŞK (BMC cancer, 2026)