Deferring adjuvant therapy for totally resected intracranial ependymoma

Abstract

Radical surgery is the most important treatment modality for ependymoma. The benefit of adjuvant radio-therapy and/or chemotherapy following a gross total resection of a low grade intracranial ependymoma is uncertain. Since 1990 we elected to defer adjuvant therapy in 7 pediatric patients with a median age of 7 years (range 3–16 years) who had a radical resection of an intracranial ependymoma and no evidence of central nervous system metastases. The primary tumor site was the cerebral hemisphere (6) and the cerebellum (1). A gross total resection was radiologically confirmed in 5 of the 7 patients. Two of the patients had a blood clot in the resection site on the postoperative magnetic resonance imaging scan. All patients are alive after a median follow-up of 44 months and the median progression-free survival is 38+ months. Five of the patients remain in continuous remission. The 2 patients with postoperative blood clots developed subclinical local recurrences, 10 and 11 months, respectively, after diagnosis. They remain in remission for 13+ and 27+ months after subsequent radical surgical procedures. Involved field radiotherapy was administered to 1 patient. After a limited period of follow-up, radical surgery alone appears to be sufficient for the majority of children with low grade ependymomas diagnosed at >3 years of age when postoperative imaging confirms a gross total resection. This is more likely to occur in supratentorial ependymomas arising in older children.