Publications by authors named "Peter M K de Blank"

Background: Treatment of childhood medulloblastoma has evolved to reduce neurotoxicity while improving survival. However, the impact of evolving therapies on late neurocognitive outcomes and adult functional independence remains unknown.

Methods: Adult survivors of childhood medulloblastoma (n = 505; median [minimum-maximum] age, 29 [18-46] years) and sibling controls (n = 727; 32 [18-58] years) from the Childhood Cancer Survivor Study completed surveys assessing neurocognitive problems and chronic health conditions (CHCs).

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Pediatric glioma therapy has evolved to delay or eliminate radiation for low-grade tumors. This study examined these temporal changes in therapy with long-term outcomes in adult survivors of childhood glioma. Among 2,501 5-year survivors of glioma in the Childhood Cancer Survivor Study diagnosed 1970-1999, exposure to radiation decreased over time.

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Background: Treatment of childhood glioma has evolved to reduce radiotherapy exposure with the goal of limiting late toxicity. However, the associations between treatment changes and neurocognition, and the contribution of neurocognition and chronic health conditions to attainment of adult independence, remain unknown.

Methods: Adult survivors of childhood glioma diagnosed in 1970-1999 in the Childhood Cancer Survivor Study (n = 1284; median [minimum-maximum] 30 [18-51] years of age at assessment; 22 [15-34] years from diagnosis) self-reported neurocognitive impairment and chronic health conditions.

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The wide variety of clinical manifestations of the genetic syndrome neurofibromatosis type 1 (NF1) are driven by overactivation of the RAS pathway. Mitogen-activated protein kinase kinase inhibitors (MEKi) block downstream targets of RAS. The recent regulatory approvals of the MEKi selumetinib for inoperable symptomatic plexiform neurofibromas in children with NF1 have made it the first medical therapy approved for this indication in the United States, the European Union, and elsewhere.

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Optic pathway gliomas (OPGs) occur in 15%-20% of children with neurofibromatosis type 1 (NF1), leading to visual deficits in fewer than half of these individuals. The goal of chemotherapy is to preserve vision, but vision loss in NF1-associated OPG can be unpredictable. Determining which child would benefit from chemotherapy and, equally important, which child is better observed without treatment can be difficult.

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Article Synopsis
  • Children with neurofibromatosis type 1 (NF1) are at risk for brain tumors and cognitive issues; this study investigates the impact of isolated chemotherapy on brain structure using diffusion tensor imaging (DTI).
  • A comparison was made between 12 pairs of children with NF1 who received chemotherapy and those who didn’t, focusing on white matter tracts linked to cognition and finding significant decreases in fractional anisotropy (FA) in those who underwent chemotherapy.
  • The findings suggest that even low-intensity chemotherapy can lead to changes in brain microstructure associated with cognition in NF1 patients, prompting calls for cognitive evaluations to identify potential decline early on, despite chemotherapy being less harmful than other treatments like radiation and surgery.
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Background: The impact of impaired vision on cognitive and psychosocial outcomes among long-term survivors of childhood low-grade gliomas has not been investigated previously but could inform therapeutic decision making.

Methods: Data from the Childhood Cancer Survivor Study were used to investigate psychological outcomes (measures of cognitive/emotional function) and socioeconomic outcomes (education, income, employment, marital status, and independent living) among astroglial tumor survivors grouped by 1) vision without impairment, 2) vision with impairment (including unilateral blindness, visual field deficits, and amblyopia), or 3) bilateral blindness. The effect of vision status on outcomes was examined with multivariate logistic regression with adjustments for age, sex, cranial radiation therapy, and medical comorbidities.

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Article Synopsis
  • The study investigates visual acuity loss in children with neurofibromatosis type 1 (NF1)-associated optic pathway gliomas (OPGs), focusing on the relationship between brain tissue microstructure and visual outcomes.
  • Researchers examined diffusion tensor imaging (DTI) of optic nerve pathways in 50 children alongside their ophthalmologic evaluations, utilizing multivariate analysis to assess the impact of fiber integrity on vision.
  • Findings reveal that decreased fractional anisotropy (FA) in the optic radiations correlates with poorer visual acuity and may help predict future changes in vision for these patients.
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