Serum Carnitine Concentrations and Cardiac Function in Pediatric, Adolescent and Young Adult Oncology Patients Receiving High-Dose Anthracyclines

Abstract

OBJECTIVE Anthracycline chemotherapy agents have significant dose-dependent cardiotoxic effects. ­Carnitine, a non-essential amino acid, is involved in long chain fatty acid oxidation, and carnitine deficiency can result in cardiomyopathy and cardiac arrhythmias. If administered concurrently with chemotherapy, carnitine supplementation could be a potential strategy to prevent cardiotoxicity. However, the association between serum carnitine concentrations and anthracycline cardiotoxicity during cancer treatment in the childhood, adolescent, and young adult (CAYA) age range has not been established. METHODS This prospective pilot cohort study characterized changes in serum carnitine concentrations and cardiac function before, during, and approximately 1 year after large-dose anthracycline therapy in newly diagnosed CAYA cancer patients. RESULTS Among 21 patients with a mean cumulative anthracycline dose exposure of 409 mg/m2 of ­doxorubicin equivalents, left ventricular ejection fraction and relative wall thickness decreased, indicating an overall decline in cardiac function. A reversible decrease in serum carnitine concentrations was also observed. A non-statistically significant positive correlation was observed; for every 1 mmol/L decrease in serum carnitine concentration, there was a 0.09% decrease in LVEF (p = 0.2). CONCLUSIONS These findings from this small pilot study suggest that there may be a relationship between serum carnitine concentrations and cardiac function after anthracycline therapy that should be evaluated in larger studies.