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Preclinical studies suggested that the mTOR signaling pathway could be a potential therapeutic target in childhood ependymomas. As a result, a phase II clinical trial (ClinicalTrials.gov identifier: NCT02155920) of single-agent everolimus was performed to test the hypothesis that inhibition of the mTOR pathway would result in tumor responses for children with recurrent and/or progressive ependymoma. Eleven patients [sex: 4 females (36.4%); median age: 8 years (range: 2 – 15 years); race: 9 white and 2 other; prior therapies: median 6 (range: 3 – 9)] were enrolled on the study. The primary tumor location for 10 participants was the posterior fossa; the primary location of the remaining tumor was the cervical spine. All patients were treated with oral everolimus 4.5 mg/m2/day (each cycle = 28 days) that was titrated to achieve serum trough levels of 5 – 15 ng/mL. Overall, everolimus was well tolerated; adverse events were grade 1 – 2 and consistent with its previously established safety profile in children. No objective tumor responses were observed. All patients discontinued therapy due to tumor progression after a median of 2 cycles of therapy (1 cycle = 2; 2 cycles = 6; 3, 4, and 8 cycles = 1 each). This study does not support the use of everolimus for children with recurrent or progressive ependymoma.

CTNI-52. PHASE II STUDY OF EVEROLIMUS (AFINITOR®) FOR CHILDREN WITH RECURRENT OR PROGRESSIVE EPENDYMOMA