Carbon-ion radiotherapy (CIRT) as treatment of pancreatic cancer at HIT: initial radiation plan analysis of the prospective phase II PACK-study
Purpose - To analyze the dose objectives and constraints applied at the prospective phase II PACK-study at Heidelberg ion therapy center (HIT) for different radiobiological models. - Methods - Treatment plans of 14 patients from the PACK-study were analyzed and recomputed in terms of physical, biolo...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
November 2023
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| In: |
Radiotherapy and oncology
Year: 2023, Jahrgang: 188, Pages: 1-7 |
| ISSN: | 1879-0887 |
| DOI: | 10.1016/j.radonc.2023.109872 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.radonc.2023.109872 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0167814023897663 
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| Verfasserangaben: | Filipa Baltazar, Thomas Tessonnier, Thomas Haberer, Juergen Debus, Klaus Herfarth, Bouchra Tawk, Maximilian Knoll, Amir Abdollahi, Jakob Liermann, Andrea Mairani |
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| 245 | 1 | 0 | |a Carbon-ion radiotherapy (CIRT) as treatment of pancreatic cancer at HIT |b initial radiation plan analysis of the prospective phase II PACK-study |c Filipa Baltazar, Thomas Tessonnier, Thomas Haberer, Juergen Debus, Klaus Herfarth, Bouchra Tawk, Maximilian Knoll, Amir Abdollahi, Jakob Liermann, Andrea Mairani |
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| 520 | |a Purpose - To analyze the dose objectives and constraints applied at the prospective phase II PACK-study at Heidelberg ion therapy center (HIT) for different radiobiological models. - Methods - Treatment plans of 14 patients from the PACK-study were analyzed and recomputed in terms of physical, biological dose and dose-averaged linear energy transfer (LETd). Both LEM-I (local effect model 1) and the adapted NIRS-MKM (microdosimetric kinetic model), were used for relative biological effectiveness (RBE)-weighted dose calculations (DBio|HIT and DBio|NIRS). A new constraint to the gastrointestinal (GI) tract was derived from the National Institute of Radiological Science (NIRS) clinical experience and considered for plan reoptimization (DBio|NIRS-const_48Gy and DBio|NIRS-const_50.4Gy). The Lyman-Kutcher-Burman (LKB) model of Normal Tissue Complication Probability (NTCP) for GI toxicity endpoints was computed. Furthermore, the computed LETd distribution was evaluated and correlated with Local Control (LC). - Results - Only two patients showed a LETd98% in the GTV greater than 44 keV/μm. A HIT-dose constraint to the GI of D2cm3=48.6GyRBEHIT was derived from the NIRS experience, in alternative to the standard at HIT Dmax = 45.6 GyRBEHIT. In comparison with the original DBio|HIT, DBio|NIRS-const_48GyandDBio|NIRS-const_50.4Gy resulted in an increase in the ITV’s D98% of 8.7% and 11.3%. The NTCP calculation resulted in a probability for gastrointestinal bleeding of 4.5%, 12.3% and 13.0%, for DBio|NIRS, DBio|NIRS-const_48Gy and DBio|NIRS-const_50.4Gy, respectively. - Conclusion - The results indicate that the current standards applied at HIT for CIRT closely align with the Japanese experience. However, to enhance tumor coverage, a more relaxed constraint on the GI tract may be considered. As the PACK-trial progresses, further analyses of various clinical endpoints are anticipated. | ||
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| 650 | 4 | |a Gastrointestinal toxicity | |
| 650 | 4 | |a Pancreatic cancer | |
| 650 | 4 | |a Treatment dose constraints | |
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