Scientific publications

Intraoperative Electron-Beam Radiation Therapy for Pediatric Ewing Sarcomas and Rhabdomyosarcomas: Long-Term Outcomes

Sole CV(1), Calvo FA(2), Polo A(3), Cambeiro M(4) [SP], Gonzalez C(5), Desco M(6), Martinez-Monge R(4).

(1) Department of Radiation Oncology, Instituto de Radiomedicina, Santiago, Chile; School of Medicine, Complutense University, Madrid, Spain.
(2) School of Medicine, Complutense University, Madrid, Spain; Department of Oncology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
(3) Service of Radiation Oncology, Hospital Universitario Ramón y Cajal, Madrid, Spain.
(4) Service of Radiation Oncology, Clínica Universidad de Navarra, Pamplona, Spain.
(5) School of Medicine, Complutense University, Madrid, Spain; Service of Radiation Oncology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
(6) School of Medicine, Complutense University, Madrid, Spain; Department of Experimental Surgery and Medicine, Hospital General Universitario Gregorio Marañón, Madrid, Spain.

Magazine: International Journal of Radiation Oncology, Biology, Physics

Date: Aug 1, 2015

Radiation Oncology

PURPOSE:
To assess long-term outcomes and toxicity of intraoperative electron-beam radiation therapy (IOERT) in the management of pediatric patients with Ewing sarcomas (EWS) and rhabdomyosarcomas (RMS).

METHODS AND MATERIALS:
Seventy-one sarcoma (EWS n=37, 52%; RMS n=34, 48%) patients underwent IOERT for primary (n=46, 65%) or locally recurrent sarcomas (n=25, 35%) from May 1983 to November 2012. Local control (LC), overall survival (OS), and disease-free survival were estimated using Kaplan-Meier methods. For survival outcomes, potential associations were assessed in univariate and multivariate analyses using the Cox proportional hazards model.

RESULTS:
After a median follow-up of 72 months (range, 4-310 months), 10-year LC, disease-free survival, and OS was 74%, 57%, and 68%, respectively. In multivariate analysis after adjustment for other covariates, disease status (P=.04 and P=.05) and R1 margin status (P<.01 and P=.04) remained significantly associated with LC and OS. Nine patients (13%) reported severe chronic toxicity events (all grade 3).

CONCLUSIONS:
A multimodal IOERT-containing approach is a well-tolerated component of treatment for pediatric EWS and RMS patients, allowing reduction or substitution of external beam radiation exposure while maintaining high local control rates.

CITATION  Int J Radiat Oncol Biol Phys. 2015 Aug 1;92(5):1069-76. doi: 10.1016/j.ijrobp.2015.04.048.

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