For the study, researchers sought to investigate the patterns of cardiac monitoring and identify factors associated with adequate monitoring among older patients with breast cancer treated with adjuvant trastuzumab. Researchers identified 2,203 patients with a median age of 72 years will full Medicare coverage, diagnosed with stage I-III breast cancer, and treated with trastuzumab-based chemotherapy.
Results showed that only 36.0% of patients were adequately monitored for cardiac toxicity. Researchers found that a more recent year of diagnosis (HR = 1.83; 95% CI: 1.32-2.54), anthracycline use (HR = 1.39; 95% CI: 1.14-1.71), female prescribing physician (HR = 1.37; 95% CI: 1.10-1.70, and physician graduating after 1990 (HR = 1.66; 95% CI: 1.29-2.12) were associated with optimal cardiac monitoring.
The findings suggest that efforts to improve the adequacy of cardiac monitoring during adjuvant trastuzumab treatment are needed, especially in patients at higher risk for cardiotoxicity.
Patients treated with adjuvant trastuzumab require adequate cardiac monitoring. We describe the patterns of cardiac monitoring and evaluate factors associated with adequate monitoring in a large population-based study of older patients with breast cancer.