Secondary malignancy risk following proton vs. X-ray treatment of mediastinal malignant lymphoma: a comparative modeling study of thoracic organ-specific cancer risk
Purpose Proton radiotherapy (PRT) is potentially associated with a lower risk for secondary malignancies due to decreased integral dose to surrounding organs at risk (OARs). Prospective trials confirming this are lacking due to the need for long term follow-up and the ethical complexities of randomi...
Gespeichert in:
| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
07 July 2020
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| In: |
Frontiers in oncology
Year: 2020, Jahrgang: 10 |
| ISSN: | 2234-943X |
| DOI: | 10.3389/fonc.2020.00989 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://doi.org/10.3389/fonc.2020.00989 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/fonc.2020.00989/full 
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| Verfasserangaben: | Laila König, Peter Haering, Clemens Lang, Mona Splinter, Bastian von Nettelbladt, Fabian Weykamp, Philipp Hoegen, Jonathan W. Lischalk, Klaus Herfarth, Jürgen Debus, and Juliane Hörner-Rieber |
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| 245 | 1 | 0 | |a Secondary malignancy risk following proton vs. X-ray treatment of mediastinal malignant lymphoma |b a comparative modeling study of thoracic organ-specific cancer risk |c Laila König, Peter Haering, Clemens Lang, Mona Splinter, Bastian von Nettelbladt, Fabian Weykamp, Philipp Hoegen, Jonathan W. Lischalk, Klaus Herfarth, Jürgen Debus, and Juliane Hörner-Rieber |
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| 520 | |a Purpose Proton radiotherapy (PRT) is potentially associated with a lower risk for secondary malignancies due to decreased integral dose to surrounding organs at risk (OARs). Prospective trials confirming this are lacking due to the need for long term follow-up and the ethical complexities of randomizing patients between modalities. The objective of the current study is to calculate the risk for secondary malignancies following PRT and photon-based intensity-modulated radiotherapy (IMRT). Materials and Methods Twenty-three patients (16 female, 7 male), previously treated with active scanning PRT for malignant mediastinal lymphoma at Heidelberg Ion Beam Therapy Center (HIT), were retrospectively re-planned using helical photon IMRT. The risk for radiation-induced secondary malignancies was estimated and evaluated using two distinct prediction models (Dasu et al., 2005; Mondlane et al., 2017; Schneider et al-, 2005; Schneider et al. 2005). Results According to the Dasu model, the median absolute total risk for tumor induction following IMRT was 4.4% (range 3.3-5.8%), 9.9% (range 2.0-27.6%), and 1.0% (range 0.5-1.5%) for lung, breast, and esophageal cancer. For PRT it was significantly lower for the aforementioned organs at 1.6% (range 0.7-2.1%), 4.5% (range 0.0-15.5), and 0.8% (range 0.0-1.6%), respectively (p≤0.01). The mortality risk from secondary malignancies was also significantly reduced for PRT relative to IMRT 1.1% vs. 3.1% (p<0.001), 0.9% vs. 1.9% (p<0.001) and 0.7% vs. 1.0% (p-<0.001) for lung, breast, and esophageal tumors, respectively. Using the Schneider model, a significant risk reduction of 54.4% (range 32.2-84.0%), 56.4% (range 16.0-99.4%), and 24.4% (range 0.0-99.0%) was seen for secondary lung, breast, and esophageal malignancies favoring PRT versus x-ray based IMRT (p≤0.01). Conclusion Based on two prediction models, PRT for malignant mediastinal lymphoma is expected to reduce the risk for radiation-induced secondary malignancies compared with the x-ray based IMRT. The young age and long natural history of patients diagnosed with mediastinal lymphoma predisposes them to a high risk of secondary malignancies following curative radiotherapy treatment, and as a consequence potentially reducing this risk by utilizing advanced radiation therapy techniques such as PRT should be considered. | ||
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