Proton and Proton-Photon Hybrid Partial Stereotactic Ablative Boost Radiotherapy (P-SABR) for Unresectable Large Tumors (LARGE-Proton)
A Prospective, Multicenter, Observational Cohort Study of Proton and Proton-Photon Hybrid Partial Stereotactic Ablative Boost Radiotherapy (P-SABR) for Unresectable Large Tumors
Przegląd badań
Status
Status
Warunki
Warunki
Interwencja / Leczenie
Interwencja / Leczenie
Szczegółowy opis
BACKGROUND Large tumors (longest diameter > 5 cm) are often unresectable and respond poorly to conventionally fractionated radiotherapy (CFRT) because of their size and hypoxic core, while normal-tissue tolerance prevents delivering stereotactic ablative radiotherapy (SABR) to the whole tumor. Partial stereotactic ablative boost radiotherapy (P-SABR) delivers a SABR boost only to the central part of a large tumor, followed by CFRT to the whole target. Proton beams, with their Bragg-peak dose fall-off, may sharpen this "onion-skin" dose distribution and further increase the biologically effective dose (BED) within the tumor core.
DESIGN This prospective, multicenter, observational cohort study will enroll 60 adults with unresectable bulky tumors (longest diameter > 5 cm) who, as part of routine care, receive one of two treatment modes: (A) proton P-SABR, in which both the proton partial-SABR boost (course 1) and the subsequent proton CFRT (course 2) are delivered at the proton center; or (B) proton-photon hybrid P-SABR, in which course 1 is delivered with protons at the proton center and course 2 CFRT is delivered with photons (IMRT/VMAT) either at the same center or at Peking University First Hospital or one of six photon sub-centers, after central review of the composite plan. Cohort membership follows the patient's own choice and care pathway; the study does not assign treatment or intervene in clinical decisions, and no formal between-cohort hypothesis testing is planned.
OUTCOMES The primary objective is to describe, in each cohort, the incidence of treatment-related grade ≥ 3 acute and late adverse events (CTCAE v5.0). Secondary objectives are dosimetric (percentage of the GTV receiving BED10 ≥ 100 Gy, PTV V95% and V100%, organ-at-risk doses) and the 1-year local control rate (RECIST 1.1, in-field). Participants are followed for up to 5 years.
Typ studiów
Typ studiów
Zapisy (Szacowany)
Zapisy
Kontakty i lokalizacje
Kontakt w sprawie studiów
Kontakt w sprawie studiów
- Nazwa: Xianshu Gao, MD, PhD
- Numer telefonu: 010-83575239
- E-mail: doctorgaoxs@126.com
Kryteria uczestnictwa
Kryteria kwalifikacji
Kryteria kwalifikacji
Wiek uprawniający do nauki
- Dorosły
- Starszy dorosły
Akceptuje zdrowych ochotników
Metoda próbkowania
Badana populacja
Opis
Inclusion Criteria:
- Histologically or cytologically confirmed malignancy
- At least one tumor with a longest diameter > 5 cm
- Not amenable to curative surgical resection, or patient declines surgery, or surgery contraindicated because of medical comorbidities
- Age ≥ 18 years
- ECOG performance status 0-2
- Life expectancy > 3 months
- Written informed consent
Exclusion Criteria:
- Prior radiotherapy to the same site
- Severe cardiopulmonary insufficiency precluding radiotherapy
- Concurrent other active malignancy
- Uncontrolled acute infection or bowel obstruction
- Pregnancy or breastfeeding
- Intracranial lesion
- Tumor directly invading the full thickness of the esophageal, gastric or intestinal wall with active ulceration, fistula or uncontrolled risk of perforation (tumors that only abut or displace a hollow organ without full-thickness invasion are not excluded)
- Uncontrolled active tumor bleeding, or impending pathological fracture requiring orthopedic intervention
- Any other condition that, in the investigator's judgment, makes the patient unsuitable for the study
Plan studiów
Jak projektuje się badanie?
Szczegóły projektu
Liczba grup / kohort
Kohorty i interwencje
Grupa / KohortaGrupa / Kohorta |
Interwencja / LeczenieInterwencja / Leczenie |
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Cohort A: Proton P-SABR
Participants who receive the entire P-SABR course with protons at Hebei Yizhou Cancer Hospital: course 1, proton partial stereotactic ablative boost (intensity-modulated proton therapy, IMPT); course 2, proton conventionally fractionated radiotherapy (CFRT).
Planned enrollment: 30.
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Course 1 (proton partial-SABR boost, IMPT): CTV 1.8-3 Gy per fraction with a simultaneous boost to the boost volume within the GTV (GTVb) of 8 Gy × 3 fractions; in larger tumors the inner GTVb (GTVb shrunk by 1 cm) is further boosted to 12 Gy × 3 fractions; critical organs at risk < 3 Gy per fraction; robust optimization on the CTV.
Course 2 (proton CFRT): CTV 1.8-3 Gy per fraction with robust optimization, to a cumulative PTV dose of 60-70 Gy on the summed plan, with GTVb BED10 ≥ 100 Gy.
Proton dose is expressed with a constant RBE of 1.1.
Both courses are delivered at Hebei Yizhou Cancer Hospital.
Inne nazwy:
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Cohort B: Proton-Photon Hybrid P-SABR
Participants who receive course 1 (proton partial stereotactic ablative boost, IMPT) at Hebei Yizhou Cancer Hospital, followed by course 2 photon conventionally fractionated radiotherapy (IMRT/VMAT with daily CBCT) delivered either at the same center (pathway A, same-center; planned n = 10) or at Peking University First Hospital or one of six photon sub-centers (pathway B, cross-center; planned n = 20) after central review of the composite plan.
Planned enrollment: 30.
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Course 1 identical to Cohort A: proton partial-SABR boost (IMPT) with GTVb 8 Gy × 3 fractions and inner GTVb 12 Gy × 3 fractions, delivered at Hebei Yizhou Cancer Hospital.
Course 2 (photon CFRT): IMRT/VMAT with daily CBCT recommended, PTV 1.8-3 Gy per fraction to a cumulative PTV dose of 60-70 Gy on the summed plan, with GTVb BED10 ≥ 100 Gy, delivered at Hebei Yizhou Cancer Hospital (same-center) or at Peking University First Hospital or a photon sub-center (cross-center).
For cross-center participants, DICOM-RT structure, plan and dose files of both courses are reviewed by the central radiotherapy QA committee, which performs deformable registration and dose summation (MIM; proton RBE = 1.1) before course 2 starts.
Target interval between courses ≤ 3 working days (maximum 7 working days).
Inne nazwy:
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Co mierzy badanie?
Podstawowe miary wyniku
Podstawowe miary wyniku
Miara wyniku |
Opis środka |
Ramy czasowe |
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Incidence of treatment-related adverse events of grade ≥ 3 (CTCAE v5.0)
Ramy czasowe: From the first fraction of radiotherapy to the end of the study
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Up to 5 years after completion of radiotherapy (acute events: from the first fraction of radiotherapy through 90 days after completion; late events: from day 91 after completion through 5 years)
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From the first fraction of radiotherapy to the end of the study
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Miary wyników drugorzędnych
Miary wyników drugorzędnych
Miara wyniku |
Opis środka |
Ramy czasowe |
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Percentage of the gross tumor volume (GTV) receiving a biologically effective dose (BED10) ≥ 100 Gy
Ramy czasowe: Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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Volume fraction (%) of the GTV receiving BED10 ≥ 100 Gy on the composite (summed) plan, extracted from the treatment planning system (proton dose converted with RBE = 1.1; dose summation in MIM ).
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Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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Planning target volume (PTV) coverage: V95% and V100%
Ramy czasowe: Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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Percentage of the PTV receiving ≥ 95% (V95%) and ≥ 100% (V100%) of the prescribed cumulative dose on the composite plan, reported per cohort as mean ± SD.
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Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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Doses to organs at risk (OARs)
Ramy czasowe: Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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Dose metrics of organs at risk (e.g., spinal cord maximum dose, esophagus, lung, bowel, brachial plexus) on the composite plan, and the proportion of participants meeting each OAR dose constraint, reported per OAR and per cohort with 95% CI.
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Up to 3 weeks after the first fraction of radiotherapy (when the composite plan of course 1 and course 2 is finalized)
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1-year local control (LC) rate
Ramy czasowe: 12 months after the first fraction of radiotherapy
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Local control is defined as the absence of progressive disease (RECIST 1.1) in in-field lesions; the in-field region is defined by the GTV/CTV/PTV projections exported from the treatment planning system (DICOM-RT) and confirmed by blinded central imaging review.
Time to local progression is measured from the first fraction of radiotherapy.
The 1-year LC rate and its Greenwood 95% CI are estimated per cohort with the Kaplan-Meier method; no between-cohort test is performed.
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12 months after the first fraction of radiotherapy
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Współpracownicy i badacze
Sponsor
Sponsor
Publikacje i pomocne linki
Publikacje ogólne
- Bai Y, Gao XS, Qin SB, Chen JY, Su MM, Liu Q, Qin XB, Ma MW, Zhao B, Gu XB, Xie M, Cui M, Qi X, Li XY. Partial stereotactic ablative boost radiotherapy in bulky non-small cell lung cancer: a retrospective study. Onco Targets Ther. 2018 May 8;11:2571-2579. doi: 10.2147/OTT.S159538. eCollection 2018.
- Bai Y, Gao X, Qin S, Li S, Ma M, Cao X, Lyu F, Chen J, Qi X, Liu S, Gao Y, Li H, Li X, Li X, Ren X, Huang L. Partial Stereotactic Ablative Radiotherapy Boost Before Conventional Radiotherapy (P-SABR) for Large (> 5 cm) Unresectable Stage III Nonsmall Cell Lung Cancer. Thorac Cancer. 2025 Jan;16(2):e15514. doi: 10.1111/1759-7714.15514. Epub 2024 Dec 14.
Daty zapisu na studia
Główne daty studiów
Rozpoczęcie studiów (Szacowany)
Rozpoczęcie studiów
Zakończenie podstawowe (Szacowany)
Zakończenie podstawowe
Ukończenie studiów (Szacowany)
Ukończenie studiów
Daty rejestracji na studia
Pierwszy przesłany
Pierwszy przesłany
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy przesłany, który spełnia kryteria kontroli jakości
Pierwszy wysłany (Rzeczywisty)
Pierwszy wysłany
Aktualizacje rekordów badań
Ostatnia wysłana aktualizacja (Rzeczywisty)
Ostatnia wysłana aktualizacja
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia przesłana aktualizacja, która spełniała kryteria kontroli jakości
Ostatnia weryfikacja
Ostatnia weryfikacja
Więcej informacji
Terminy związane z tym badaniem
Słowa kluczowe
Inne numery identyfikacyjne badania
Inne numery identyfikacyjne badania
- LARGE-Proton-001
Plan dla danych uczestnika indywidualnego (IPD)
Planujesz udostępniać dane poszczególnych uczestników (IPD)?
Opis planu IPD
Informacje o lekach i urządzeniach, dokumenty badawcze
Bada produkt leczniczy regulowany przez amerykańską FDA
Bada produkt urządzenia regulowany przez amerykańską FDA
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