Central nervous system morbidity following an initial isolated central nervous system relapse and its subsequent therapy in childhood acute lymphoblastic leukemia.

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Abstract
The frequency and types of major CNS toxicity and morbidity were analyzed in 107 children with acute lymphoblastic leukemia (ALL) following an isolated primary CNS relapse. Seventy-nine (73%) have had multiple subsequent marrow or CNS relapses requiring intensive and prolonged therapy to the CNS. Median survival time is 2 yr. Of these 79 patients, 2/3 have had 1 or more types of major CNS toxicity, including epileptiform seizures (35), moderate to severe structural abnormalities (24 of 27 evaluated), major motor disabilities (9), blindness (2), CNS infection (6), cranial nerve palsies (2) and intracranial lymphoma (2). The remaining 28 patients (26%) have had no or 1 additional CNS relapse and have received therapy for a median of 8 yr. One half of this surviving group of patients have had major CNS toxicity, including seizures (9), major motor disability (2), and intracranial calcifications (12/19). When neuropsychologic evaluations were compared between the 28 survivors and 50 of their contemporaries who had been in initial continuous complete remission, the CNS survivors had significantly lower Full Scale IQ scores (83 .+-. 16 vs. 99 .+-. 14, P = < 0.001) with similarly lower measures of academic performance. The relative contributions of meningeal leukemia itself and intrathecal or radiation therapy to these effects cannot be determined. Since major CNS sequelae occurred in the majority of patients who had a primary isolated CNS relapse and the frequency of CNS relapse is dependent on the efficacy of the method of CNS prophylaxis, the best method of avoiding major CNS sequelae is the most effective form of CNS prophylaxis.