Cardiac Outcomes in Adult Survivors of Childhood Cancer Exposed to Cardiotoxic Therapy: A Cross-sectional Study.

<bold>Background: </bold>Studies of cardiac disease among adult survivors of childhood cancer have generally relied on self-reported or registry-based data.<bold>Objective: </bold>To systematically assess cardiac outcomes among survivors of childhood cancer.<bold>Design: </bold>Cross-sectional study.<bold>Setting: </bold>St. Jude Children's Research Hospital.<bold>Patients: </bold>1853 adult survivors of childhood cancer, aged 18 years or older, who received cancer-related cardiotoxic therapy at least 10 years earlier.<bold>Measurements: </bold>Baseline history and physical examination, fasting metabolic and lipid panels, echocardiography, electrocardiography, and 6-minute walk test.<bold>Results: </bold>One half of the survivors (52.3%) were men with a median age of 8 years (range, 0 to 24 years) at cancer diagnosis and 31 years (range, 18 to 60 years) at evaluation. Cardiomyopathy was present in 7.4% survivors (newly identified at the time of evaluation in 4.7%), coronary artery disease in 3.8% (newly identified in 2.2%), valvular regurgitation or stenosis in 28.0% (newly identified in 24.8%), and conduction or rhythm abnormalities in 4.4% (newly identified in 1.4%). Nearly all survivors were asymptomatic. The prevalence of cardiac conditions increased with age at evaluation, ranging from 3% to 24% among survivors aged 30 to 39 years to 10% to 37% among those aged 40 years or older. In multivariable analysis, survivors exposed to anthracycline doses of 250 mg/m2 or more had greater odds of cardiomyopathy (odds ratio, 2.7 [95% CI, 1.1 to 6.9]) than those who were not exposed. Survivors exposed to heart radiation also had increased odds of cardiomyopathy (odds ratio, 1.9 [CI, 1.1 to 3.7]) compared with those who were not exposed. Radiation exposure greater than 1500 cGy with any anthracycline exposure conferred the greatest odds for valve findings.<bold>Limitations: </bold>Sixty-one percent of survivors exposed to anthracycline chemotherapy or cardiac-directed radiation participated. A comparison group and longitudinal assessments were not available.<bold>Conclusion: </bold>Cardiovascular screening identified considerable subclinical disease among adult survivors of childhood cancer.<bold>Primary Funding Source: </bold>National Cancer Institute, American Lebanese Syrian Associated Charities. [ABSTRACT FROM AUTHOR]