Seizures' impact on cognition and quality of life in childhood cancer survivors.

Background: The objective of this study was to determine the impact of seizure‐related factors on neurocognitive, health‐related quality of life (HRQOL), and social outcomes in survivors of childhood cancer. Methods: Survivors of childhood cancer treated at St. Jude Children's Hospital (n = 2022; 48.3% female; median age, 31.5 years; median time since diagnosis, 23.6 years) completed neurocognitive testing and questionnaires. The presence, severity, resolution, and treatment history of seizures were abstracted from medical records. Adjusting for the age at diagnosis, sex, and prior cancer therapy, multivariable models examined the impact of seizures on neurocognitive and HRQOL outcomes. Mediation analyses were conducted for social outcomes. Results: Seizures were identified in 232 survivors (11.5%; 29.9% of survivors with central nervous system [CNS] tumors and 9.0% of those without CNS tumors). In CNS tumor survivors, seizures were associated with poorer executive function and processing speed (P <.02); in non‐CNS tumor survivors, seizures were associated with worse function in every domain (P <.05). Among non‐CNS survivors, seizure severity was associated with worse processing speed (P =.023), and resolution was associated with better executive function (P =.028) and attention (P =.044). In CNS survivors, seizure resolution was associated with improved attention (P =.047) and memory (P <.02). Mediation analysis revealed that the impact of seizures on social outcomes was mediated by neurocognitive function. Conclusions: Seizures in cancer survivors adversely affect long‐term functional and psychosocial outcomes independently of cancer therapy. The resolution of seizure occurrence is associated with better outcomes. Seizure severity is associated with poorer outcomes and should be a focus of clinical management and patient education. Adult survivors of childhood cancer are at risk for poorer cognitive, health‐related quality of life, and social outcomes. Seizure frequency, independently of the underlying etiology, is associated with poorer outcomes in non–brain tumor survivors, and this implies that they may be a more vulnerable population with a lower threshold for impact from seizures of any severity. [ABSTRACT FROM AUTHOR]