Daily Adjustment of the Radiation Dose in MRI-guided Stereotactic Radiotherapy for Tumors in the Abdominal and Pelvic Regions (ACTION)
Adaptive Fractionation in Online MR-guided SBRT for Abdominal and Pelvic Target Volumes
SBRT delivers high-dose radiation to precisely defined target volumes and is an effective locally ablative treatment option for both primary tumours and oligometastases in various settings, including lesions in the abdomen or pelvis. However, SBRT in these regions faces considerable challenges such as inter-fractional organ motion and anatomical deformation, which can compromise treatment precision.
MR-guided SBRT offers a solution, providing superior soft-tissue contrast and enabling real-time, online treatment plan adaptation over the course of SBRT. This approach reduces the risk of geographical miss and overdose to adjacent, vulnerable OARs. Currently, MR-guided SBRT uses a fixed dose per fraction, only adjusting target volume and OAR contours for anatomical changes when performing plan adaptation. However, overlaps between planning target volumes (PTVs) and dose-limiting OARs regularly require compromises in PTV coverage. To address this, AF aims to also adjust dose per fraction based on daily PTV-OAR overlap. With this approach, more dose is applied on treatment days with less PTV-OAR overlap while less dose is applied on days with more PTV-OAR overlap. This trial assesses the feasibility of AF in MR-guided SBRT for abdominal and pelvic tumours that show PTV-overlap with one or more dose-limiting OARs, ultimately aiming to enhance PTV dose coverage without increasing toxicity.
Panoramica dello studio
Stato
Stato
Condizioni
Condizioni
Intervento / Trattamento
Intervento / Trattamento
Tipo di studio
Tipo di studio
Iscrizione (Stimato)
Iscrizione
Fase
Fase
- Non applicabile
Contatti e Sedi
Contatto studio
Contatto studio
- Nome: Jan Unkelbach, Prof. Dr. rer. nat.
- Numero di telefono: +41 44 255 85 49
- Email: jan.unkelbach@usz.ch
Backup dei contatti dello studio
- Nome: Lena Kretzschmar, Dr. med.
- Email: lena.kretzschmar@usz.ch
Luoghi di studio
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Canton of Zurich
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Zurich, Canton of Zurich, Svizzera, 8091
- Reclutamento
- University Hospital Zurich
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Criteri di partecipazione
Criteri di ammissibilità
Criteri di ammissibilità
Età idonea allo studio
- Adulto
- Adulto più anziano
Accetta volontari sani
Descrizione
Inclusion Criteria:
- Karnofsky performance status ≥70
- Abdominal or pelvic malignancy (primary or secondary) with previous histological confirmation of the primary tumour, amenable to SBRT in 5 fractions (excluding SBRT to primary tumour in patients with prostate cancer) Note: patients with primary prostate cancer are eligible, but SBRT to the primary tumour in the prostate cannot be performed within the study
- Total prescribed SBRT dose > 30 Gy (constraint for dose-limiting OAR) over 5 treatment fractions
- Distance of the GTV ≤ 1 cm from at least one dose-limiting OAR (bowel / duodenum / stomach) in the available diagnostic images
- Patients able to tolerate long (approximately 60 minutes) treatment time according to clinical evaluation of the treating radiation oncologist
- Patients willing and able to comply with scheduled visits, treatment, and other trial procedures
Exclusion Criteria:
- Previous radiation therapy directly overlapping with planned SBRT (type I re-irradiation)
- More than one PTV irradiated in the same plan
- Contraindications for MRI, e.g., patients with metal fragments or implanted devices that are not MR compatible such as certain types of pacemakers and aneurysm clips or severe claustrophobia
- SBRT not indicated or not possible
- Inability to follow the procedures of the trial, e.g. due to language problems of the participant
Piano di studio
Come è strutturato lo studio?
Dettagli di progettazione
- Scopo principale: Trattamento
- Assegnazione: Non randomizzato
- Modello interventistico: Assegnazione parallela
- Mascheramento: Nessuno (etichetta aperta)
Numero di armi
Armi e interventi
Gruppo di partecipanti / ArmGruppo di partecipanti / Arm |
Intervento / TrattamentoIntervento / Trattamento |
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Sperimentale: RT with AF
Patients with PTV/OAR overlap will receive AF, with dose adapted daily based on anatomy.
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The fraction dose to the PTV will be adapted based on the volume overlap of PTV and the dose-limiting OAR(s) (bowel / duodenum / stomach) on the planning MRI scan of the day ("geometry-of-the-day").
The treatment plan is then approved by the treating physician and independently verified according to department-internal standard.
MR-guided fraction dose adaptation will be repeated at each of the 5 fractions, until the prescribed total dose is reached.
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Comparatore attivo: RT without AF
Patients without PTV/OAR overlap will receive standard fractionated treatment.
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Patients that qualify for inclusion in the study but for whom AF is no viable treatment due to lacking PTV/OAR overlap in the planning scans.
These patients are treated according to clinical standard of care (SoC), i.e. without dose adaptation, and function as a control group.
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Cosa sta misurando lo studio?
Misure di risultato primarie
Misure di risultato primarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
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Proportion of patients with successful daily dose adaptation
Lasso di tempo: from enrollment to end of treatment at 1-2 weeks
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Proportion of patients treated with daily dose-adapted treatment, who received at least one fraction of non-uniformly fractionated treatment with expectation of a benefit in PTV-coverage of ≥ 1ccGy
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from enrollment to end of treatment at 1-2 weeks
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Misure di risultato secondarie
Misure di risultato secondarie
Misura del risultato |
Misura Descrizione |
Lasso di tempo |
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Acute treatment toxicities
Lasso di tempo: during treatment (1-2 weeks) and until 90 days after
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Acute treatment toxicities for all included patients measured with Common Terminology Criteria for Adverse Events
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during treatment (1-2 weeks) and until 90 days after
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Interfractional variation in PTV/OAR overlap volume
Lasso di tempo: during treatment (1-2 weeks)
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interfractional variation in PTV/OAR overlap volume, in cc
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during treatment (1-2 weeks)
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Interfractional variation in GTV/OAR distance
Lasso di tempo: during treatment (1-2 weeks)
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interfractional variation in GTV/OAR distance, in mm
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during treatment (1-2 weeks)
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Dosimetric difference in PTV-coverage between algorithm-based calculation and the reference plan
Lasso di tempo: after end of treatment (2 weeks after last fraction)
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PTV coverage quantified as the area above the dose-volume-histogram curve measured in cc x Gy
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after end of treatment (2 weeks after last fraction)
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Collaboratori e investigatori
Sponsor
Sponsor
Investigatori
Investigatori
- Investigatore principale: Reinhardt Krcek, Dr. med., University of Zurich
Studiare le date dei record
Studia le date principali
Inizio studio (Effettivo)
Inizio studio
Completamento primario (Stimato)
Completamento primario
Completamento dello studio (Stimato)
Completamento dello studio
Date di iscrizione allo studio
Primo inviato
Primo inviato
Primo inviato che soddisfa i criteri di controllo qualità
Primo inviato che soddisfa i criteri di controllo qualità
Primo Inserito (Effettivo)
Primo Inserito
Aggiornamenti dei record di studio
Ultimo aggiornamento pubblicato (Effettivo)
Ultimo aggiornamento pubblicato
Ultimo aggiornamento inviato che soddisfa i criteri QC
Ultimo aggiornamento inviato che soddisfa i criteri QC
Ultimo verificato
Ultimo verificato
Maggiori informazioni
Termini relativi a questo studio
Parole chiave
Termini MeSH pertinenti aggiuntivi
- Neoplasie per sede
- Neoplasie
- Neoplasie pelviche
- Neoplasie addominali
- Amministrazione dei servizi sanitari
- Qualità, accesso e valutazione dell'assistenza sanitaria
- Tecniche investigative
- Terapie
- Procedure chirurgiche, operative
- Qualità dell'assistenza sanitaria
- Indicatori di qualità, assistenza sanitaria
- Radioterapia
- Tecniche stereotassiche
- Procedure neurochirurgiche
- Standard di cura
- Radiochirurgia
Altri numeri di identificazione dello studio
Altri numeri di identificazione dello studio
- RAO-25-019
- 2026-00067 (Altro identificatore: BASEC)
Piano per i dati dei singoli partecipanti (IPD)
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Informazioni su farmaci e dispositivi, documenti di studio
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