General Information About Childhood Ependymoma
The PDQ childhood brain tumor treatment summaries are organized primarily according to the World Health Organization (WHO) classification of nervous system tumors.[1,2] For a full description of the classification of nervous system tumors and a link to the corresponding treatment summary for each type of brain tumor, refer to the PDQ summary on Childhood Brain and Spinal Cord Tumors Treatment Overview.
Dramatic improvements in survival have been achieved for children and adolescents with cancer. Between 1975 and 2002, childhood cancer mortality decreased by more than 50%. Childhood and adolescent cancer survivors require close follow-up because cancer therapy side effects may persist or develop months or years after treatment. (Refer to the PDQ summary Late Effects of Treatment for Childhood Cancer for specific information about the incidence, type, and monitoring of late effects in childhood and adolescent cancer survivors.)
Primary brain tumors are a diverse group of diseases that together constitute the most common solid tumor of childhood. Immunohistochemical analysis, cytogenetic and molecular genetic findings, and measures of mitotic activity are increasingly used in tumor diagnosis and classification. Brain tumors are classified according to histology, but tumor location and extent of spread are important factors that affect treatment and prognosis.
Ependymomas arise from ependymal cells that line the ventricles and passageways in the brain and the center of the spinal cord. Ependymal cells produce cerebrospinal fluid (CSF). These tumors are classified as supratentorial or infratentorial. In children, most ependymomas are infratentorial tumors that arise in or around the fourth ventricle. According to the WHO classification of brain tumors, ependymal tumors are classified into the following four main subtypes:
- Subependymoma (WHO Grade I).
- Myxopapillary ependymoma (WHO Grade I).
- Ependymoma (WHO Grade II).
- Anaplastic ependymoma (WHO Grade III).
The location of the tumor determines the clinical presentation. Treatment begins with surgery. The type of adjuvant therapy given, such as a second surgery, chemotherapy, or radiation therapy, depends on the following:
- Subtype of ependymoma.
- Whether the tumor was completely removed during the initial surgery.
- Whether the tumor has disseminated throughout the central nervous system.
- Child's age.
The clinical presentation of ependymoma is dependent on tumor location.
- Infratentorial (posterior fossa) ependymoma: In children, approximately 65% to 75% of ependymomas arise in the posterior fossa. Children with posterior fossa ependymoma may present with signs and symptoms of obstructive hydrocephalus due to obstruction at the level of the fourth ventricle. They may also present with ataxia, neck pain, or cranial nerve palsies.
- Supratentorial ependymoma: Supratentorial ependymoma may result in headache, seizures, or location-dependent focal neurologic deficits.
- Spinal cord ependymoma: Spinal cord ependymomas, which are often the myxopapillary variant, tend to cause back pain, lower extremity weakness, and/or bowel and bladder dysfunction.
Every patient suspected of having ependymoma should be evaluated with diagnostic imaging of the whole brain and spinal cord. The most sensitive method available for evaluating spinal cord subarachnoid metastasis is spinal magnetic resonance imaging (MRI) performed with gadolinium. This is ideally done before surgery to avoid confusion with postoperative blood. If MRI is used, the entire spine is generally imaged in at least two planes with contiguous MRI slices performed after gadolinium enhancement. If feasible, CSF cytological evaluation should be conducted.Prognostic Factors
Unfavorable factors affecting outcome (except as noted) include the following:
- Gain of chromosome 1q25. Gain of chromosome 1q25 is present in approximately 20% of pediatric intracranial ependymoma cases and has been reported as a negative prognostic factor by multiple research groups.[8-11]
- Gene expression profile.
- One expression-defined group occurs primarily in young children and is characterized by a largely balanced genomic profile with an increased occurrence of chromosome 1q gain and expression of genes and proteins previously shown to be associated with poor prognosis, such as tenascin C and epidermal growth factor receptor.[8,14]
- The second expression-defined group occurs primarily in older children and adults and is characterized by a more favorable prognosis and by numerous cytogenetic abnormalities involving whole chromosomes or chromosomal arms.
Other factors that have been reported to be associated with poor prognosis for pediatric ependymoma include expression of the enzymatic subunit of telomerase (hTERT) [15-17] and expression of the neural stem cell marker Nestin.[Level of evidence: 3iiiA]
- Tumor location. Cranial variants of ependymoma have a less favorable outcome than primary spinal cord ependymomas.[19,20] Location within the spinal cord may also affect outcome, with tumors in the lower portion of the spinal cord having a worse prognosis.[Level of evidence: 3iiiA]
- Younger age at diagnosis.[Level of evidence: 3iiiDii]
- Anaplastic histology.[22-24]; [Level of evidence: 3iA]; [Level of evidence: 3iiiDi]
- Subtotal resection.
- Lower doses of radiation.
- Higher proliferation marker.[28,29]
- MIB-1 labeling index.
Surveillance neuroimaging, coupled with clinical assessments, are generally recommended after treatment for ependymoma. The frequency and duration have been arbitrarily determined and the utility is uncertain. Most practitioners obtain MRI imaging of the brain and/or spinal cord every 3 months for the first 1 to 2 years after treatment. After 2 years, imaging every 6 months for the next 3 years is often undertaken.References
- Louis DN, Ohgaki H, Wiestler OD, et al., eds.: WHO Classification of Tumours of the Central Nervous System. 4th ed. Lyon, France: IARC Press, 2007.
- Louis DN, Ohgaki H, Wiestler OD, et al.: The 2007 WHO classification of tumours of the central nervous system. Acta Neuropathol 114 (2): 97-109, 2007. [PUBMED Abstract]
- Smith MA, Seibel NL, Altekruse SF, et al.: Outcomes for children and adolescents with cancer: challenges for the twenty-first century. J Clin Oncol 28 (15): 2625-34, 2010. [PUBMED Abstract]
- Gurney JG, Smith MA, Bunin GR: CNS and miscellaneous intracranial and intraspinal neoplasms. In: Ries LA, Smith MA, Gurney JG, et al., eds.: Cancer incidence and survival among children and adolescents: United States SEER Program 1975-1995. Bethesda, Md: National Cancer Institute, SEER Program, 1999. NIH Pub.No. 99-4649., Chapter 3, pp 51-63. Also available online. Last accessed May 30, 2014.
- Central Brain Tumor Registry of the United States: Statistical Report: Primary Brain Tumors in the United States, 1997-2001. Hinsdale, Ill: Central Brain Tumor Registry of the United States, 2004. Also available online. Last accessed May 30, 2014.
- Andreiuolo F, Puget S, Peyre M, et al.: Neuronal differentiation distinguishes supratentorial and infratentorial childhood ependymomas. Neuro Oncol 12 (11): 1126-34, 2010. [PUBMED Abstract]
- Moreno L, Pollack IF, Duffner PK, et al.: Utility of cerebrospinal fluid cytology in newly diagnosed childhood ependymoma. J Pediatr Hematol Oncol 32 (6): 515-8, 2010. [PUBMED Abstract]
- Mendrzyk F, Korshunov A, Benner A, et al.: Identification of gains on 1q and epidermal growth factor receptor overexpression as independent prognostic markers in intracranial ependymoma. Clin Cancer Res 12 (7 Pt 1): 2070-9, 2006. [PUBMED Abstract]
- Korshunov A, Witt H, Hielscher T, et al.: Molecular staging of intracranial ependymoma in children and adults. J Clin Oncol 28 (19): 3182-90, 2010. [PUBMED Abstract]
- Kilday JP, Mitra B, Domerg C, et al.: Copy number gain of 1q25 predicts poor progression-free survival for pediatric intracranial ependymomas and enables patient risk stratification: a prospective European clinical trial cohort analysis on behalf of the Children's Cancer Leukaemia Group (CCLG), Societe Francaise d'Oncologie Pediatrique (SFOP), and International Society for Pediatric Oncology (SIOP). Clin Cancer Res 18 (7): 2001-11, 2012. [PUBMED Abstract]
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- Wani K, Armstrong TS, Vera-Bolanos E, et al.: A prognostic gene expression signature in infratentorial ependymoma. Acta Neuropathol 123 (5): 727-38, 2012. [PUBMED Abstract]
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- Tabori U, Ma J, Carter M, et al.: Human telomere reverse transcriptase expression predicts progression and survival in pediatric intracranial ependymoma. J Clin Oncol 24 (10): 1522-8, 2006. [PUBMED Abstract]
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- Milde T, Hielscher T, Witt H, et al.: Nestin expression identifies ependymoma patients with poor outcome. Brain Pathol 22 (6): 848-60, 2012. [PUBMED Abstract]
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- Oh MC, Sayegh ET, Safaee M, et al.: Prognosis by tumor location for pediatric spinal cord ependymomas. J Neurosurg Pediatr 11 (3): 282-8, 2013. [PUBMED Abstract]
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- Merchant TE, Jenkins JJ, Burger PC, et al.: Influence of tumor grade on time to progression after irradiation for localized ependymoma in children. Int J Radiat Oncol Biol Phys 53 (1): 52-7, 2002. [PUBMED Abstract]
- Korshunov A, Golanov A, Sycheva R, et al.: The histologic grade is a main prognostic factor for patients with intracranial ependymomas treated in the microneurosurgical era: an analysis of 258 patients. Cancer 100 (6): 1230-7, 2004. [PUBMED Abstract]
- Amirian ES, Armstrong TS, Aldape KD, et al.: Predictors of survival among pediatric and adult ependymoma cases: a study using Surveillance, Epidemiology, and End Results data from 1973 to 2007. Neuroepidemiology 39 (2): 116-24, 2012. [PUBMED Abstract]
- Tihan T, Zhou T, Holmes E, et al.: The prognostic value of histological grading of posterior fossa ependymomas in children: a Children's Oncology Group study and a review of prognostic factors. Mod Pathol 21 (2): 165-77, 2008. [PUBMED Abstract]
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