Evidence map›Paper›PMID 34997969›Full record

ReviewMedical physics2022

Ultra-high dose rate electron beams and the FLASH effect: From preclinical evidence to a new radiotherapy paradigm.

Emil Schüler, Munjal Acharya, Pierre Montay-Gruel, Billy W Loo, Marie-Catherine Vozenin, Peter G Maxim

Abstract readReview
In one paragraph

Review in Medical physics, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 85 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
85citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

85 citing papers in PubMed, 2 syntheses or guidelines pooled it.

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25 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Emil SchülerDivision of Radiation Oncology, Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
Munjal AcharyaDepartment of Anatomy and Neurobiology, University of California Irvine, Irvine, California, USA.
Pierre Montay-GruelDepartment of Radiation Oncology, University of California Irvine, Irvine, California, USA.
Billy W LooDepartment of Radiation Oncology and Stanford Cancer Institute, Stanford University School of Medicine, Stanford, California, USA.
Marie-Catherine VozeninLaboratory of Radiation Oncology/DO/Radio-Oncology/CHUV, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland.
Peter G MaximDepartment of Radiation Oncology, University of California Irvine, Irvine, California, USA.

Funding

Tumor Evolution and Metastasis ProgramP30CA016672 · NCI · UNIVERSITY OF TX MD ANDERSON CAN CTR · PI Fabien Delerue · 1985 to 2026
$290.8M
University of California Health Participation in the National COVID Cohort Collaborative (N3C)UL1TR001414 · NCATS · UNIVERSITY OF CALIFORNIA-IRVINE · PI COOPER, DAN M, VILAIN, ERIC J. · 2015 to 2023
$35.1M
Project 4: Mechanistic Basics of FLASH Effect: Role of O2P01CA244091 · NCI · UNIVERSITY OF CALIFORNIA-IRVINE · PI LIMOLI, CHARLES · 2020 to 2024
$9.6M
Institutional Career Development CoreKL2TR001416 · NCATS · UNIVERSITY OF CALIFORNIA-IRVINE · PI CAIOZZO, VINCENT JAMES, DEMETRIOU, MICHAEL · 2015 to 2023
$5.6M
Glial immune signaling in radiation-induced brain injuryR01CA251110 · NCI · UNIVERSITY OF CALIFORNIA-IRVINE · PI ACHARYA, MUNJAL M · 2021 to 2025
$2.3M
NCATS NIH HHS KL2 TR001416NCATS NIH HHS UL1 TR001414NCI NIH HHS P01 CA244091NCI NIH HHS P30 CA016672NCI NIH HHS R01 CA251110NIH program project PO1CA244091the American Cancer Society (ACS) Research Scholar RSG-1714601-CCEthe Swiss National Fund SNF Synergia FNS CRS II5_186369the University Cancer Foundation via the Institutional Research Grant program at the University of Texas MD Anderson Cancer Center, Division of Radiation OncologyUCI Institute for Clinical and Translational Sciences KL2 KL2TR001416
6 · The paper itself

Abstract

In their seminal paper from 2014, Fauvadon et al. coined the term FLASH irradiation to describe ultra-high-dose rate irradiation with dose rates greater than 40 Gy/s, which results in delivery times of fractions of a second. The experiments presented in that paper were performed with a high-dose-per-pulse 4.5 MeV electron beam, and the results served as the basis for the modern-day field of FLASH radiation therapy (RT). In this article, we review the studies that have been published after those early experiments, demonstrating the robust effects of FLASH RT on normal tissue sparing in preclinical models. We also outline the various irradiation parameters that have been used. Although the robustness of the biological response has been established, the mechanisms behind the FLASH effect are currently under investigation in a number of laboratories. However, differences in the magnitude of the FLASH effect between experiments in different labs have been reported. Reasons for these differences even within the same animal model are currently unknown, but likely has to do with the marked differences in irradiation parameter settings used. Here, we show that these parameters are often not reported, which complicates large multistudy comparisons. For this reason, we propose a new standard for beam parameter reporting and discuss a systematic path to the clinical translation of FLASH RT.

Indexed as

ElectronsRadiotherapyAnimalsClinical ProtocolsRadiotherapy Dosagebiological effectsdosimetryelectron FLASHFLASH effectreporting system

Identifiers

PMID34997969
PMCPMC9032195

What OpenQuestion holds

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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.