Cognitive function of children and adolescent survivors of acute lymphoblastic leukemia: A meta‑analysis

Mavrea,Kalliopi; Efthymiou,Vasiliki; Katsibardi,Katerina; Tsarouhas,Konstantinos; Kanaka‑Gantenbein,Christina; Spandidos,Demetrios A.; Chrousos,George; Kattamis,Antonis; Bacopoulou,Flora

doi:10.3892/ol.2021.12523

Cognitive function of children and adolescent survivors of acute lymphoblastic leukemia: A meta‑analysis

Authors:
- Kalliopi Mavrea
- Vasiliki Efthymiou
- Katerina Katsibardi
- Konstantinos Tsarouhas
- Christina Kanaka‑Gantenbein
- Demetrios A. Spandidos
- George Chrousos
- Antonis Kattamis
- Flora Bacopoulou
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Affiliations: Clinic for Assessment of Adolescent Learning Difficulties, Center for Adolescent Medicine and UNESCO Chair on Adolescent Health Care, First Department of Pediatrics, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens 11527, Greece, University Research Institute of Maternal and Child Health and Precision Medicine, and UNESCO Chair on Adolescent Health Care, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens 11527, Greece, Pediatric Hematology‑Oncology Unit, First Department of Pediatrics, National and Kapodistrian University of Athens, Aghia Sophia Children's Hospital, Athens 11527, Greece, Department of Cardiology, University Hospital of Larissa, Larissa 41110, Greece, Laboratory of Clinical Virology, School of Medicine, University of Crete, Heraklion 71409, Greece
Published online on: February 5, 2021 https://doi.org/10.3892/ol.2021.12523
Article Number: 262
Copyright: © Mavrea et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Pediatric cancer and its treatment may have an impact on the neurocognitive functions of childhood cancer survivors (CCS). The aim of the present meta‑analysis was to compare the intelligence quotient (IQ) scores between CCS of acute lymphoblastic leukemia (ALL) and controls. A comprehensive electronic search identified original research articles that reported scores of the Wechsler Intelligence Scale (WISC; WISC‑III, WISC‑IV and WISC‑R) for children and adolescents, aged 6‑16 years at evaluation, survivors of ALL and healthy controls. The included CCS had completed anticancer treatment and were in remission at the time of assessment. A total of 16 studies were included in the meta‑analysis, out of 128 extracted studies, and involved a total of 1,676 children and adolescents: 991 CCS (ALL) and 685 healthy controls. Among the studies, a random effects model revealed a moderate estimate of effect size [standardized mean difference (SMD), ‑0.78; 95% CI, ‑1.05 to ‑0.50], indicating that the WISC scores for total IQ were significantly lower in the CCS than in the controls. The mean total IQ range was 85.2‑107.2 in the CCS and 88.4‑114.1 in the controls. The difference in the mean total IQ between controls and CCS ranged from ‑13.8 to 20.6. As regards the WISC scores for verbal IQ, 11 studies were included. A random effects model revealed a moderate estimate of effect size (SMD, ‑0.71; 95% CI, ‑1.05 to ‑0.38), indicating that the WISC scores for verbal IQ were significantly lower in the CCS than in the controls. Among the 9 studies that had available data for performance IQ scores, a fixed effect model revealed a moderate estimate of effect size (SMD, ‑0.80; 95% CI, ‑1.09 to ‑0.52), indicating that the WISC scores for performance IQ were significantly lower in the CCS than in the controls. As the survival rates of children and adolescents with ALL are steadily increasing, regular, lifelong follow‑up for neurocognitive late effects is imperative in order to improve their education and employment prospects and overall, their quality of life.

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