Genetic Factors Influencing Neurocognitive Outcomes in Pediatric Brain Tumor Survivors

Overview

This study investigated the association between somatic genetic variants in DNA repair genes and neurocognitive outcomes in pediatric brain tumor survivors. Analysis of 46 children treated with surgery, chemotherapy, and radiation revealed specific single nucleotide polymorphisms (SNPs) correlated with IQ scores, highlighting potential genetic markers for predicting long-term cognitive effects.

Background

Brain tumors are the second most common pediatric cancer, with improving survival rates leading to increased focus on long-term neurocognitive deficits. Treatment modalities such as radiation and chemotherapy, along with clinical factors like age at diagnosis and tumor location, contribute to cognitive outcomes. Genetic abnormalities and DNA repair capacity may influence both cancer development and response to therapy. Identifying genetic markers could enhance risk stratification and enable early cognitive interventions.

Data Highlights

Key Findings

• 46 pediatric brain tumor survivors were genotyped for 614 SNPs after quality control filtering.
• IQ scores were dichotomized at 90, with 56% of patients scoring ≤90 and 43% >90.
• Low and high IQ groups were comparable in age at treatment, sex distribution, and time from treatment to IQ testing.
• Tumor location differed significantly between IQ groups, with posterior fossa tumors more common in the low IQ group.
• Linear regression models identified SNPs in DNA repair genes associated with most recent IQ and changes in IQ over time, considering radiation type.
• Top 10 SNPs with strongest associations were reported, suggesting genetic variants may influence neurocognitive outcomes post-treatment.

Clinical Implications

Genotyping pediatric brain tumor survivors for DNA repair gene variants may help identify patients at higher risk for neurocognitive deficits. This could inform personalized treatment planning and prompt early cognitive interventions. Awareness of tumor location and radiation modality alongside genetic risk factors can optimize long-term neurocognitive care.

Conclusion

The study supports a link between genetic variants in DNA repair pathways and neurocognitive outcomes in pediatric brain tumor survivors. Incorporating genetic profiling may enhance prediction and management of cognitive late effects.

References

1. American Cancer Society 2023 -- Pediatric Brain Tumor Incidence
2. Survival Trends 1975-2002 -- Pediatric Brain Tumor Outcomes
3. Recent Survival Data 2013-2019 -- Pediatric Brain Tumors
4. Radiation Dose and Neurocognitive Risk -- Clinical Studies
5. Proton vs Photon Radiation Effects -- Neurocognitive Outcomes
6. Surgical Impact on Cognition -- Pediatric Brain Tumors
7. Sex Differences in Neurocognitive Outcomes -- Pediatric Oncology
8. Age at Diagnosis and Cognitive Risk -- Pediatric Brain Tumors
9. Hydrocephalus and Cognitive Outcomes -- Pediatric Brain Tumors
10. Neurofibromatosis Type-1 and Cognitive Deficits -- Genetic Risk
11. Socioeconomic and Parental Education Effects -- Cognitive Outcomes
12. DNA Repair and Cancer Therapy Response -- Genetic Studies
13. Illumina SNP Genotyping Protocol -- Methodology
14. Wechsler Intelligence Scale for Children (WISC-V) -- Cognitive Assessment