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Vazdar, Ljubica; Gabrić, Ivo Darko; Kruljac, Ivan; Pintarić, Hrvoje; Šeparović, Robert; Kirigin Biloš, Lora Stanka; Pavlović, Mirjana; Tečić Vuger, Ana; Štefanović, Mario
Scientific reports, 07/2021, Letnik: 11, Številka: 1Journal Article
Abstract Trastuzumab has improved the prognosis of HER2 positive breast cancer, but cardiotoxicity remains a concern. We aimed to identify risk factors for trastuzumab-induced cardiotoxicity, with an emphasis on the HER2 Ile655Val single nucleotide polymorphism. This single-center case–control study included 1056 patients with early-stage HER2 positive breast cancer that received adjuvant trastuzumab. Cardiotoxicity was defined as a decline in left ventricular ejection fraction (LVEF) > 15% in patients without previous cardiomyopathy, or > 10% in patients with baseline LVEF of < 50%. Patient characteristics and cardiac parameters were compared in 78 (7.38%) cases and 99 randomly assigned controls, and the polymorphism was genotyped using real-time polymerase chain reaction. Cardiotoxicity was independently associated with advanced age ( P = 0.024), lower body mass index ( P = 0.023), left breast involvement ( P = 0.001), N3 status ( P = 0.004), diabetes ( P = 0.016), and a family history of coronary artery disease ( P = 0.019). Genotype distribution was as follows: A/A (Ile/Ile) was found in 111 (62.7%) patients, A/G (Ile/Val) in 60 (33.9%) patients, and G/G (Val/Val) in 6 (3.4%) patients. The genotype was not associated with cardiotoxicity or the severity of heart failure, reversibility, and recovery time. We found no association between the HER2 Ile655Val polymorphism and trastuzumab-induced cardiotoxicity; therefore, we do not recommend routine cardiotoxicity-risk stratification using this polymorphism.
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