Cited by 103Radiation Therapy and DosimetryEffects of Radiation ExposureAdvanced Radiotherapy Techniques

Rapid MCNP simulation of DNA double strand break (DSB) relative biological effectiveness (RBE) for photons, neutrons, and light ions

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Stewart, Robert D, Streitmatter, Seth W, Argento, David C, Kirkby, Charles, Goorley, John T, Moffitt, Greg, Jevremovic, Tatjana, Sandison, George A·2015·Physics in Medicine & Biology

Abstract

To account for particle interactions in the extracellular (physical) environment, information from the cell-level Monte Carlo damage simulation (MCDS) for DNA double strand break (DSB) induction has been integrated into the general purpose Monte Carlo N-particle (MCNP) radiation transport code system. The effort to integrate these models is motivated by the need for a computationally efficient model to accurately predict particle relative biological effectiveness (RBE) in cell cultures and in vivo . To illustrate the approach and highlight the impact of the larger scale physical environment (e.g. establishing charged particle equilibrium), we examined the RBE for DSB induction (RBE DSB ) of x-rays, 137 Cs γ -rays, neutrons and light ions relative to γ -rays from 60 Co in monolayer cell cultures at various depths in water. Under normoxic conditions, we found that 137 Cs γ -rays are about 1.7% more effective at creating DSB than γ -rays from 60 Co (RBE DSB = 1.017) whereas 60–250 kV x-rays are 1.1 to 1.25 times more efficient at creating DSB than 60 Co. Under anoxic conditions, kV x-rays may have an RBE DSB up to 1.51 times as large as 60 Co γ -rays. Fission neutrons passing through monolayer cell cultures have an RBE DSB that ranges from 2.6 to 3.0 in normoxic cells, but may be as large as 9.93 for anoxic cells. For proton pencil beams, Monte Carlo simulations suggest an RBE DSB of about 1.2 at the tip of the Bragg peak and up to 1.6 a few mm beyond the Bragg peak. Bragg peak RBE DSB increases with decreasing oxygen concentration, which may create opportunities to apply proton dose painting to help address tumor hypoxia. Modeling of the particle RBE for DSB induction across multiple physical and biological scales has the potential to aid in the interpretation of laboratory experiments and provide useful information to advance the safety and effectiveness of hadron therapy in the treatment of cancer.

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  • The RBE model here presented for clustered DNA damage induction is the first fully based on ab-initio calculations starting from physical interactions.

    “and the one here presented for clustered DNA damage induction is the first fully based on ab-initio calculations starting from physical interactions.”

    From The origin of neutron biological effectiveness as a function of energy (2016) · cites this paper as [20]

    The Introduction describes this paper’s RBE formulas as empirical fits to MCDS estimates, not as fully ab-initio calculations. The section “Relationship of the MCDS to track structure simulations of DNA damage” says the MCDS places lesions indirectly using parameters, while describing earlier track-structure simulations that begin with physical particle interactions. This contradicts both the claimed basis of this model and its claimed priority. (LLM, conf=0.88)

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  • Few RBE models for neutrons exist all together, from older applications to neutron therapy up to recent neutron RBE for DNA damage induction.

    “To our knowledge few RBE models for neutrons exist all together, from older applications to neutron therapy1819 up to recent neutron RBE for DNA damage induction20”

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References 85 · Cited by 103

Research works printed but not linked: 49

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Authors
Stewart, R. D., Streitmatter, S. W., Argento, D. C., Kirkby, C., Goorley, J. T., Moffitt, G., Jevremovic, T., & Sandison, G. A.
Affiliations
  • University of Washington (US)
  • University of Utah (US)
  • University of Calgary (CA)
  • Los Alamos National Laboratory (US)
  • The University of Utah
Venue
Physics in Medicine & Biology
Published
2015-10-09
Volume
60
Issue
21
Pages
8249-8274
ISSN
  • 0031-9155 (ISSN-L)
  • 1361-6560
OpenAlex
W2251384621
Cited by
103
References
85
Citations by year
2026: 4 · 2025: 7 · 2024: 13 · 2023: 3 · 2022: 9 · 2021: 9 · 2020: 14 · 2019: 15 · 2018: 11 · 2017: 12 · 2016: 5 · 2015: 1
FWCI
7.67
Type
journal article
Language
en
Open access
Locations
  • Physics in Medicine and Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Energy
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Radiation Therapy and Dosimetry
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
  • Physical Sciences › Physics and Astronomy › Radiation › Advanced Radiotherapy Techniques
Keywords
DNA double-strand breaks, relative biological effectiveness, radiative transfer, fission neutrons, proton pencil beam, Bragg peak, tumor hypoxia, oxygen dependence, X-rays, gamma radiation, particle therapy
MeSH terms
Computer Simulation, Gamma Rays, Humans, Monte Carlo Method, Neutrons, Protons, Relative Biological Effectiveness, X-Rays, Photons, DNA Breaks, Double-Stranded

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