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    Patterns of care, tolerability and safety of the first cohort of patients treated on a novel high-field MR-Linac within the MOMENTUM Study: Initial results from a prospective Multi-Institutional Registry

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    Authors
    van Otterloo, S. R. M.
    Christodouleas, J. P.
    Blezer, E. L. A.
    Akhiat, H.
    Brown, K.
    Choudhury, Ananya
    Eggert, D.
    Erickson, B. A.
    Daamen, L. A.
    Faivre-Finn, Corinne
    Fuller, C. D.
    Goldwein, J.
    Hafeez, S.
    Hall, E.
    Harrington, K. J.
    van der Heide, U. A.
    Huddart, R. A.
    Intven, M. P. W.
    Kirby, A. M.
    Lalondrelle, S.
    McCann, C.
    Minsky, B. D.
    Mook, S.
    Nowee, M. E.
    Oelfke, U.
    Orrling, K.
    Philippens, M. E. P.
    Sahgal, A.
    Schultz, C. J.
    Tersteeg, R.
    Tijssen, R. H. N.
    Tree, A. C.
    van Triest, B.
    Tseng, C. L.
    Hall, W. A
    Verkooijen, H. M.
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    Affiliation
    Department of Radiation Oncology, University Medical Center Utrecht, Utrecht, NL.
    Issue Date
    2021
    
    Metadata
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    Abstract
    Introduction: High-field MR-Linacs, linear accelerators (linac) combined with a diagnostic MRI scanner and online adaptive workflow, potentially give rise to novel online anatomic and response adaptive radiotherapy paradigms. Since the first high-field (1.5T) MR-Linac received regulatory approval in late 2018, little is known about clinical use, patient tolerability of daily high-field MRIs, and toxicity of treatments. Herein we report the initial experience within XXX (XXX), a prospective international registry of the XXX. Materials and methods: Patients were included between February 2019 to October 2020 at seven institutions in four countries. We used descriptive statistics to describe the patterns of care, tolerability (the percentage of patients discontinuing their course early) and safety (grade 3-5 CTCAE v.5 acute toxicity within 3 months after end of treatment). Results: A total 943 patients participated in the XXX Study, 702 of whom had complete baseline data at the time of this analysis. Patients were primarily male (79%) with a median age of 68 years (range: 22-93), and were treated for 39 different indications. The most frequent indications were prostate (40%), oligometastatic lymph node (17%), brain (12%), and rectal (10%) cancers. The median number of fractions was 5 (range 1-35). Six patients discontinued MR-Linac treatments, but none due to an inability to tolerate repeated high-field MRIs. Of the 415 patients with complete data on acute toxicity at 3 months follow up, eighteen (4%) patients experienced grade 3 acute toxicity related to radiation. No grade 4 or 5 acute toxicity related to radiation was observed. Conclusion: In the first 21 months of our study, patterns of care were diverse with respect to clinical utilization, body sites and radiation prescriptions. No patient discontinued treatment due to inability to tolerate daily high-field MR-scans and the acute radiation toxicity experience was encouraging.
    Citation
    van Otterloo SR de M, Christodouleas JP, Blezer ELA, Akhiat H, Brown K, Choudhury A, et al. Patterns of care, tolerability and safety of the first cohort of patients treated on a novel high-field MR-Linac within the MOMENTUM Study: Initial results from a prospective Multi-Institutional Registry. International Journal of Radiation Oncology*Biology*Physics. 2021 Jul.
    Journal
    International Journal of Radiation Oncology Biology Physics
    URI
    http://hdl.handle.net/10541/624443
    DOI
    10.1016/j.ijrobp.2021.07.003
    PubMed ID
    34265394
    Additional Links
    https://dx.doi.org/10.1016/j.ijrobp.2021.07.003
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijrobp.2021.07.003
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