AbstractOBJECTIVETo examine longitudinal neuropsychological functioning in children receiving treatment for medulloblastoma on COG clinical trial ACNS0331.METHODSChildren aged 3 and older diagnosed with medulloblastoma participated in neuropsychological testing as part of… Click to show full abstract
AbstractOBJECTIVETo examine longitudinal neuropsychological functioning in children receiving treatment for medulloblastoma on COG clinical trial ACNS0331.METHODSChildren aged 3 and older diagnosed with medulloblastoma participated in neuropsychological testing as part of the original study design or in conjunction with COG protocol ALTE07C1. Children under 8 were randomized to receive craniospinal irradiation (CSI) of either 18 Gy (reduced dose) or 23.4 Gy (standard dose); all children aged 8+ received 23.4 Gy. All children received either a 54 Gy boost to the entire posterior fossa (standard boost) or tumor bed (reduced volume boost), plus standard chemotherapy. Intellectual functioning (IQ) of children was evaluated an average of 0.67 (+0.21) and 2.99 (+0.59) years post-diagnosis.RESULTSOf 464 eligible and evaluable patients enrolled on ACNS0331, 337 (72.6%) completed intellectual testing at one or both timepoints (mean age at diagnosis=9.1 [SD=4.06], range 3-19 years; 65.3% male; 83.1% white). Mean estimated IQ was in the average range at both timepoints (mean IQ T1=95.7 + 15.14; mean IQ T2=94.4 + 14.21), and declined an average of 2.2 (+ 9.98) points over time. Among children aged 3-7 at diagnosis, those randomized to standard dose CSI exhibited greater IQ declines over time than those in the lower-dose group (-7.2 vs. -0.4, respectively; p= .04). Among all ages, younger children (p <.01) and those who received a standard boost volume (p=.01) exhibited lower IQ at T2.CONCLUSIONSResults of this prospective, randomized clinical trial suggest that children receiving a boost to the whole posterior fossa experience steeper declines in intellectual functioning over time. In addition, reducing whole-brain dose for younger children was also associated with less decline. Results suggest that strategies to limit the CSI dose and/or boost volume in children treated for medulloblastoma may improve neuropsychological outcomes. These approaches need to be weighed against the possible impact on disease control.
               
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