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Blood, 27 August 2009, Vol. 114, No. 9, pp. 1746-1752.
Prepublished online as a Blood First Edition Paper on June 22, 2009; DOI 10.1182/blood-2008-12-186502.
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Submitted December 10, 2008
Accepted June 1, 2009
A comparison of neurocognitive functioning in children previously randomized to dexamethasone or prednisone in the treatment of childhood acute lymphoblastic leukemia
Nina S. Kadan-Lottick*, Pim Brouwers, David Breiger, Thomas Kaleita, James Dziura, Haibei Liu, Lu Chen, Megan Nicoletti, Linda Stork, Bruce Bostrom, and Joseph P. Neglia
Yale University School of Medicine & Yale Cancer Center, New Haven, CT, United States
Texas Children's Cancer Center, Houston, TX & National Institute of Mental Health, Rockville, MD, United States
University of Washington School of Medicine, Seattle, WA, United States
David Geffen School of Medicine at UCLA, Los Angeles, CA, United States
Yale Center for Clinical Investigation, New Haven, CT, United States
Children's Oncology Group Operations Center, Arcadia, CA, United States
Oregon Health & Science University, Portland, OR, United States
Children's Hospitals and Clinics, Minneapolis, MN, United States
University of Minnesota Medical School, Minneapolis, MN, United States
* Corresponding author; email: nina.kadan-lottick{at}yale.edu.
In previous clinical trials of childhood acute lymphoblastic leukemia (ALL), dexamethasone resulted in higher event free survival rates than prednisone, presumably due to greater central nervous system penetration. Dexamethasone's association with long-term neurocognitive toxicity is unknown. In this multi-site study, we measured neurocognitive functioning in 92 children with standard risk ALL, 1-9.99 years at diagnosis, at a mean of 9.8 years after randomization to prednisone (n=41) or dexamethasone (n=51) on CCG 1922 . No significant overall differences in mean neurocognitive and academic performance scores were found between the prednisone and dexamethasone groups after adjusting for age, gender, and time since diagnosis. The exception was that patients receiving dexamethasone scored a third of a standard deviation worse on Word Reading (98.8 ±1.7 vs. 104.9±1.8; p=0.02). There were no group differences in the distribution of test scores or the parents' report of neurological complications, psychotropic drug use, and special education. Further analyses suggested for the dexamethasone group, older age of diagnosis was associated with worse neurocognitive functioning; for the prednisone group, younger age at diagnosis was associated with worse functioning. In conclusion, our study did not demonstrate any meaningful differences in long-term cognitive functioning of childhood ALL patients based on corticosteroid randomization. This study is registered with www.clinicaltrials.gov under NCT00085176.

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