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Excessive Treatment Failures in Patients With Parameningeal Rhabdomyosarcoma With Reduced-dose Cyclophosphamide and

John T Lucas1, Alberto S Pappo2, Jianrong Wu3

  • 1Departments of Radiation Oncology.

Journal of Pediatric Hematology/Oncology
|April 24, 2018
PubMed

Insights

Delayed radiotherapy in pediatric parameningeal rhabdomyosarcoma led to high locoregional failure rates. Early intervention with upfront radiation is crucial for high-risk patients to improve outcomes and prevent treatment failure.

Area of Science:

  • Pediatric Oncology
  • Radiation Oncology
  • Medical Imaging

Background:

  • Parameningeal rhabdomyosarcoma (PMR) in pediatric patients with high-risk features necessitates prompt treatment.
  • Delayed radiotherapy initiation is a concern due to increased risks of local and leptomeningeal failure.

Purpose of the Study:

  • To report early findings from a multi-institutional prospective trial evaluating delayed primary site radiation and reduced-dose cyclophosphamide in pediatric PMR.
  • To assess the impact of this treatment strategy on locoregional control.

Main Methods:

  • Prospective, multi-institutional trial enrollment of pediatric patients with parameningeal tumors.
  • Incorporation of delayed primary site radiation and reduced-dose cyclophosphamide in initial protocol therapy.

Main Results:

  • An excessive number of locoregional treatment failures were observed with the delayed radiotherapy approach.
  • The initial trial design demonstrated suboptimal local control in pediatric PMR patients.

Conclusions:

  • Delayed radiotherapy in conjunction with reduced-dose cyclophosphamide is associated with high rates of locoregional failure in high-risk pediatric parameningeal rhabdomyosarcoma.
  • The trial was amended to implement upfront radiation therapy for patients with high-risk features.
  • Investigators should maintain vigilance for treatment failure when considering delayed radiotherapy strategies.

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