What is the comprehensive management strategy for recurrent ependymoma?

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Comprehensive Management of Recurrent Ependymoma

For recurrent ependymoma, prioritize maximal safe re-resection as first-line therapy, followed by re-irradiation (either full-course fractionated or hypofractionated stereotactic), with chemotherapy reserved only after local treatment options are exhausted. 1

Surgical Re-Resection: The Primary Intervention

Re-operation is the cornerstone of recurrent ependymoma management and directly impacts survival outcomes. The EANO guidelines demonstrate clear survival benefits stratified by extent of re-resection 1:

  • Gross total resection (GTR): 5-year event-free survival (EFS) of 19%
  • Incomplete resection: 5-year EFS of 14%
  • No repeat surgery: 5-year EFS of only 8%

Recent data further supports this aggressive surgical approach, showing that GTR of recurrence significantly improves overall survival compared to subtotal resection 2. This survival advantage occurs without necessarily increasing morbidity 3.

Critical surgical considerations:

  • Pursue GTR whenever anatomically feasible
  • Consider second-look surgery if initial re-resection was incomplete
  • Centralize surgical review for incompletely resected tumors to optimize outcomes 3

Re-Irradiation: The Second Pillar

Re-irradiation achieves durable responses in both adults and children and should be employed after surgical resection. 1

For Locally Recurrent Disease:

Craniospinal irradiation (CSI) with focal boost is superior to focal re-irradiation alone for local recurrences. Among 33 patients with only local recurrence, CSI-RT2 achieved 5-year overall survival of 78% versus 36% with focal RT2 alone (P = 0.040) 2. For posterior fossa local recurrences specifically, 5-year OS was 83% with CSI versus 30% with focal RT2 2.

Re-irradiation dosing strategies:

  • CSI to 23.4-36 Gy followed by focal boost to 54 Gy total 2
  • Alternative: Full-course fractionated irradiation
  • Alternative: Hypofractionated stereotactic irradiation 1

For Disseminated or Synchronous Failures:

Outcomes remain poor (5-year OS 20%) even with CSI-RT2, indicating the need for additional systemic approaches in this subset 2.

Chemotherapy: Third-Line After Local Options Exhausted

The role of chemotherapy for recurrent ependymoma in adults remains unclear and should only be considered when surgery and radiotherapy options have been exhausted. 1

Temozolomide (TMZ) - Most Studied Agent:

TMZ shows modest activity primarily in chemotherapy-naïve patients, with responses appearing delayed. 1

Evidence for TMZ efficacy:

  • In chemo-naïve patients: 22% response rate (complete + partial), median PFS 9.69 months, median OS 30.55 months 1
  • In heavily pretreated patients: Only 4% response rate, median PFS 2 months, OS 3 months 1
  • Real-world data confirms TMZ monotherapy achieves 57% disease control rate with 6-month PFS of 85.7% and 12-month PFS of 57.1% 4

Key caveat: TMZ activity is limited by lack of MGMT promoter methylation in most ependymomas, and even when present, methylation may not correlate with response 1.

Combination Approaches:

TMZ + Lapatinib (targeting ErbB1/ErbB2):

  • Median PFS: 45 weeks for WHO grade II, 25.3 weeks for WHO grade III 1
  • Responses correlated with higher ErbB2 mRNA expression 1
  • Real-world data less encouraging: DCR only 33%, median PFS 2.9 months 4

Bevacizumab-based regimens:

  • Can provide clinical benefit in select patients 1
  • Bevacizumab alone: DCR 33% with rare cases of prolonged stabilization (>58 months) 4
  • Bevacizumab + fotemustine: PFS 14.1 months 4
  • Note: MRI changes may not meet current radiological response criteria 1

Pediatric Chemotherapy Considerations:

For children with recurrent disease, platinum-based regimens remain most effective:

  • Cisplatin + etoposide are the most effective agents to date 3
  • Continuous oral etoposide is well-tolerated and may be active for recurrent intramedullary ependymoma 1
  • Various combinations (etoposide, vincristine, cyclophosphamide, platinum derivatives, high-dose methotrexate) show 40-50% response rates 1

Emerging Approaches

Immunotherapy shows promise, particularly for ZFTA-positive ependymomas (previously called PFA ependymomas). A single-institution study demonstrated prolonged PFS with immunotherapy in six patients, reflected in PFS ratio ≥1 5. However, this requires further validation in larger cohorts.

Treatment Algorithm

  1. First priority: Maximal safe surgical re-resection

    • Aim for GTR whenever possible
    • Consider second-look surgery if initial resection incomplete

  2. Second priority: Re-irradiation

    • For local recurrence: CSI (23.4-36 Gy) + focal boost to 54 Gy
    • Alternative: Hypofractionated stereotactic or full-course fractionated RT
    • Timing: After surgical resection

  3. Third priority: Systemic therapy (only after local options exhausted)

    • First-line systemic: TMZ monotherapy (standard schedule) if chemo-naïve
    • Second-line systemic: Consider bevacizumab-based combinations or TMZ + lapatinib (if ErbB2 expression high)
    • Pediatric: Cisplatin + etoposide preferred
    • Investigational: Immunotherapy for ZFTA-positive tumors

  4. Sequential therapy: Up to five lines of systemic therapy is feasible in selected cases with good performance status 4

Critical Pitfalls to Avoid

  • Do not defer surgery in favor of systemic therapy - re-operation provides the most significant survival benefit
  • Do not use focal re-irradiation alone for local recurrences - CSI-RT2 is superior
  • Do not expect TMZ responses in heavily pretreated patients - efficacy is primarily in chemo-naïve patients
  • Do not rely on MGMT methylation status to predict TMZ response in ependymoma (unlike glioblastoma)
  • Do not expect rapid responses to TMZ - responses are typically delayed in appearance 1

Prognostic Factors at Recurrence

Favorable factors:

  • GTR at re-operation 1, 2
  • Local-only recurrence (versus disseminated) 2
  • Chemotherapy-naïve status 1
  • Longer time to recurrence (median 5.4 years to local failure) 6

Unfavorable factors:

  • Disseminated or synchronous local + disseminated failure 2
  • Prior chemotherapy exposure 1
  • Inability to achieve re-resection 1

References

3
Research

Management strategies for recurrent ependymoma in the paediatric population.

Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery, 2009

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