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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.
Purpose:
The challenge in early Hodgkin's disease (HD) in children is to maintain good survival rates while sparing organs at risk. This study assesses the feasibility of active breathing control (ABC) in children, and compares normal tissue irradiation with and without ABC.
Methods And Materials:
Between May 2003 and June 2004, seven children with HD with mediastinal involvement, median age 15, were treated by chemotherapy and involved-field radiation therapy. A free-breathing computed tomography simulation scan and one additional scan during deep inspiration using ABC were performed. A comparison between planning treatment with clinical target volume including supraclavicular regions, mediastinum, and hila was performed, both in free breathing and using ABC.
Results:
For a prescription of 36 Gy, pulmonary dose-volume histograms revealed a mean reduction in lung volume irradiated at more than 20 Gy (V20) and 30 Gy (V30) of 25% and 26%, respectively, using ABC (p = 0.016). The mean volume of heart irradiated at 30 Gy or more decreased from 15% to 12% (nonsignificant). The mean dose delivered to breasts in girls was small in both situations (less than 2 Gy) and stable with or without ABC. Considering axillary irradiation, the mean dose delivered to breasts remained low (<9 Gy), without significant difference using ABC or not. The mean radiation dose delivered to thyroid was stable using ABC or not.
Conclusions:
Using ABC is feasible in childhood. The use of ABC decreases normal lung tissue irradiation. Concerning heart irradiation, a minimal gain is also shown. No significant change has been demonstrated concerning breast and thyroid irradiation.
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