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Original Article
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Volume 332:1738-1744 June 29, 1995 Number 26
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Female Sex and Higher Drug Dose as Risk Factors for Late Cardiotoxic Effects of Doxorubicin Therapy for Childhood Cancer
Steven E. Lipshultz, M.D., Stuart R. Lipsitz, D.Sc., Suzanne M. Mone, M.S., Allen M. Goorin, M.D., Stephen E. Sallan, M.D., Stephen P. Sanders, M.D., E. John Orav, Ph.D., Richard D. Gelber, Ph.D., and Steven D. Colan, M.D.

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ABSTRACT

Background Late cardiotoxic effects of doxorubicin are increasingly a problem for patients who survive childhood cancer. Cardiotoxicity is often progressive, and some patients have disabling symptoms. Our objective was to identify risk factors for late cardiotoxicity.

Methods We examined echocardiograms from 120 children and adults who had received cumulative doses of 244 to 550 mg of doxorubicin per square meter of body-surface area for the treatment of acute lymphoblastic leukemia or osteogenic sarcoma in childhood, a mean of 8.1 years earlier. Measurements of blood pressure and left ventricular function, contractility (measured as the stress–velocity index), end-diastolic posterior-wall thickness, end-diastolic dimension, mass, and afterload (measured as end-systolic wall stress) were compared with sex-specific values from a cohort of 296 normal subjects.

Results All echocardiographic measurements were abnormal at follow-up a minimum of two years after the end of therapy, with more frequent and severe abnormalities in female patients. In a multivariate analysis, female sex and a higher cumulative dose of doxorubicin were associated with depressed contractility (P<0.001), and there was an interaction between these two variables. Independent and significant associations were found between a higher rate of administration of doxorubicin and increased afterload (P<0.001), left ventricular dilatation, and depressed left ventricular function; between a higher cumulative dose and depressed left ventricular function (P<0.001); between a younger age at diagnosis and reduced left-ventricular-wall thickness and mass and increased afterload; and between a longer time since the completion of doxorubicin therapy and reduced left-ventricular-wall thickness and increased afterload (P<0.001).

Conclusions Female sex and a higher rate of administration of doxorubicin were independent risk factors for cardiac abnormalities after treatment with doxorubicin for childhood cancer; the prevalence and severity of abnormalities increased with longer follow-up.


Source Information

From the Department of Cardiology (S.E.L., S.M.M., S.P.S., S.D.C.) and the Division of Hematology–Oncology (A.M.G., S.E.S.), Children's Hospital; the Department of Pediatrics, Harvard Medical School (S.E.L., A.M.G., S.E.S., S.P.S., R.D.G., S.D.C.); the Department of Pediatric Oncology (A.M.G., S.E.S.) and the Division of Biostatistics (S.R.L., R.D.G.), Dana–Farber Cancer Institute; the Department of Biostatistics, Harvard School of Public Health (S.R.L., E.J.O., R.D.G.); and the Department of Medicine, Brigham and Women's Hospital (E.J.O.) — all in Boston.

Address reprint requests to Dr. Lipshultz at the Department of Cardiology, Children's Hospital, 300 Longwood Ave., Boston, MA 02115.

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Related Letters:

Doxorubicin-Induced Cardiotoxicity
Silber J. H., Barber G., Paz-Ares L., Dobbs N., Twelves C.
Extract | Full Text  
N Engl J Med 1995; 333:1359-1360, Nov 16, 1995. Correspondence

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