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.
Studieoversigt
Status
Status
Betingelser
Betingelser
Intervention / Behandling
Intervention / Behandling
Undersøgelsestype
Undersøgelsestype
Tilmelding (Anslået)
Tilmelding
Fase
Fase
- Ikke anvendelig
Kontakter og lokationer
Studiekontakt
Studiekontakt
- Navn: Jan Unkelbach, Prof. Dr. rer. nat.
- Telefonnummer: +41 44 255 85 49
- E-mail: jan.unkelbach@usz.ch
Undersøgelse Kontakt Backup
- Navn: Lena Kretzschmar, Dr. med.
- E-mail: lena.kretzschmar@usz.ch
Studiesteder
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Canton of Zurich
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Zurich, Canton of Zurich, Schweiz, 8091
- Rekruttering
- University Hospital Zurich
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Deltagelseskriterier
Berettigelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
- Voksen
- Ældre voksen
Tager imod sunde frivillige
Beskrivelse
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
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Ikke-randomiseret
- Interventionel model: Parallel tildeling
- Maskning: Ingen (Åben etiket)
Antal våben
Våben og indgreb
Deltagergruppe / ArmDeltagergruppe / Arm |
Intervention / BehandlingIntervention / Behandling |
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Eksperimentel: 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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Aktiv komparator: 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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Hvad måler undersøgelsen?
Primære resultatmål
Primære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Proportion of patients with successful daily dose adaptation
Tidsramme: 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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Sekundære resultatmål
Sekundære resultatmål
Resultatmål |
Foranstaltningsbeskrivelse |
Tidsramme |
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Acute treatment toxicities
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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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Samarbejdspartnere og efterforskere
Sponsor
Sponsor
Efterforskere
Efterforskere
- Ledende efterforsker: Reinhardt Krcek, Dr. med., University of Zurich
Datoer for undersøgelser
Studer store datoer
Studiestart (Faktiske)
Studiestart
Primær færdiggørelse (Anslået)
Primær færdiggørelse
Studieafslutning (Anslået)
Studieafslutning
Datoer for studieregistrering
Først indsendt
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først indsendt, der opfyldte QC-kriterier
Først opslået (Faktiske)
Først opslået
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Faktiske)
Sidste opdatering sendt
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Nøgleord
Yderligere relevante MeSH-vilkår
- Neoplasmer efter sted
- Neoplasmer
- Neoplasmer i bækkenet
- Abdominale neoplasmer
- Sundhedstjenester Administration
- Sundhedsvæsenets kvalitet, adgang og evaluering
- Undersøgelsesteknikker
- Terapeutik
- Kirurgiske procedurer, operative
- Sundhedskvalitet
- Kvalitetsindikatorer, sundhedsvæsenet
- Strålebehandling
- Stereotaksiske teknikker
- Neurokirurgiske procedurer
- Standard for pleje
- Radiokirurgi
Andre undersøgelses-id-numre
Andre undersøgelses-id-numre
- RAO-25-019
- 2026-00067 (Anden identifikator: BASEC)
Plan for individuelle deltagerdata (IPD)
Planlægger du at dele individuelle deltagerdata (IPD)?
Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter
Studerer et amerikansk FDA-reguleret lægemiddelprodukt
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