Conformal Radiation Therapy for Pediatric Patients with Low-Grade Glioma: Results from the Children's Oncology Group Phase 2 Study ACNS0221

Joel M. Cherlow, Dennis W.W. Shaw, Linda R. Margraf, Daniel C. Bowers, Jie Huang, Maryam Fouladi, Arzu Onar-Thomas, Tianni Zhou, Ian F. Pollack, Amar Gajjar, Sandy K. Kessel, Patricia L. Cullen, Kevin McMullen, John C. Wellons, Thomas E. Merchant

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Purpose: To determine the rate of marginal relapse, progression-free survival (PFS), and overall survival (OS) in patients with pediatric low-grade glioma (PLGG) treated with conformal radiation therapy (CRT) with a clinical target volume (CTV) margin of 5 mm in the Children's Oncology Group trial ACNS0221. Methods and Materials: Patients aged 3 to 21 years with unresectable progressive, recurrent, or residual PLGG were eligible for this study. Patients younger than 10 years were required to have received at least 1 chemotherapy course. Patients with neurofibromatosis type I were not eligible. All patients underwent magnetic resonance imaging-based planning and received 54 Gy CRT in 30 fractions with a 5-mm CTV margin. Results: Of 85 eligible patients (median age, 13.6 years) treated between March 2006 and December 2010, 14 were younger than 10 years and 36 received prior chemotherapy. Sixty-six had pilocytic astrocytoma, 15 had other histologic subtypes, and 4 had unbiopsied chiasmatic lesions. Events included 23 relapses (19 central, 4 distant, and no marginal) and 7 deaths. At a median follow-up of 5.15 years, 5-year PFS was 71% ± 6% and OS was 93% ± 4%. Male sex (P =.068) and large tumor size (P =.050) trended toward significance for association with decreased PFS. Age, histology, tumor location, time between diagnosis and study entry, and MIB-1 status were not associated with PFS. OS was negatively associated with male sex (P =.064), non-pilocytic astrocytoma histology (P =.010), and large tumor size (P =.0089). Conclusions: For patients with PLGG, CRT with a CTV margin of 5 mm yields an acceptable PFS and does not lead to a high rate of marginal relapse.

Original languageEnglish (US)
Pages (from-to)861-868
Number of pages8
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number4
StatePublished - Mar 15 2019

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research


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