Ependymomas in Children and Adults

Area of Science:

• Neuro-oncology
• Central Nervous System (CNS) Tumors
• Molecular Classification of Tumors

Background:

• Ependymomas constitute 5% of adult and 10% of pediatric CNS tumors.
• Recent research suggests radial glial cells as the origin, challenging the ependymal cell theory.
• Tumor location varies: spinal cord in adults, intracranial in pediatric populations.

Purpose of the Study:

• To summarize current understanding of ependymoma origin, classification, and clinical aspects.
• To highlight the significance of molecular classification over histopathology for prognosis.
• To outline clinical manifestations, treatment goals, and prognostic factors.

Main Methods:

• Review of recent studies on ependymoma cell of origin.
• Analysis of molecular and histopathological classification systems.
• Summary of clinical presentation, treatment strategies, and survival data.

Main Results:

• Molecular classification into nine subgroups shows greater clinical utility and prognostic value.
• RELA-fusion-positive ependymomas represent a distinct molecular variant.
• Prognostic factors include age, grade, and tumor location; intracranial anaplastic ependymomas in children have the worst prognosis.

Conclusions:

• Molecular classification is crucial for understanding ependymoma behavior and patient outcomes.
• Gross total resection is the primary treatment goal.
• Overall 5-year survival for ependymomas is approximately 60-70%.