Active breathing control for Hodgkin's disease in childhood and adolescence: feasibility, advantages, and limits

Line Claude1, Claude Malet, Pascal Pommier

  • 1Department of Radiotherapy, Centre Léon Bérard, Lyon, France. claude@lyon.fnclcc.fr

Insights

Active breathing control (ABC) is feasible in children with Hodgkin's disease (HD), reducing lung irradiation. This technique shows minimal benefit for heart dose and no significant change for breast or thyroid doses.

Area of Science:

  • Pediatric Oncology
  • Radiation Oncology
  • Medical Physics

Background:

  • Early-stage Hodgkin's disease (HD) in children requires treatment balancing survival with organ sparing.
  • Minimizing radiation dose to healthy tissues is crucial to reduce long-term side effects in pediatric cancer patients.

Purpose of the Study:

  • To assess the feasibility of active breathing control (ABC) in pediatric patients with HD.
  • To compare normal tissue irradiation, specifically lungs, heart, breasts, and thyroid, with and without ABC during radiation therapy planning.

Main Methods:

  • Seven children with HD and mediastinal involvement underwent CT simulation with free-breathing and ABC.
  • Treatment plans were compared for clinical target volumes including supraclavicular regions, mediastinum, and hila.
  • Pulmonary, cardiac, breast, and thyroid doses were analyzed based on dose-volume histograms.

Main Results:

  • ABC significantly reduced the mean lung volume irradiated at 20 Gy (V20) by 25% and at 30 Gy (V30) by 26% (p=0.016).
  • A non-significant reduction in heart irradiation was observed.
  • Mean doses to breasts and thyroid remained low and showed no significant difference with or without ABC.

Conclusions:

  • Active breathing control is a feasible technique for pediatric patients with HD.
  • ABC effectively reduces radiation dose to normal lung tissue.
  • While minimal cardiac dose reduction was noted, ABC did not significantly impact breast or thyroid doses.
Abstract

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