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Track-event theory of cell survival with second-order repair

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Abstract

When fractionation schemes for hypofractionation and stereotactic body radiotherapy are considered, a reliable cell survival model at high dose is needed for calculating doses of similar biological effectiveness. In this work, a simple model for cell survival which is valid also at high dose is developed from Poisson statistics. It is assumed that a cell is killed by an event that is defined by two double-strand breaks on the same or different chromosomes. Two different mechanisms can produce events. A one-track event is always represented by two simultaneous double-strand breaks. A two-track event results in one double-strand break. Therefore, at least two two-track events on the same or different chromosomes are necessary to produce an event. It is assumed that two double-strand breaks can be repaired with a certain repair probability. Both the one-track events and the two-track events are statistically independent. From the stochastic nature of cell killing which is described by the Poisson distribution, the cell survival probability was derived. The model was fitted to experimental data. It was shown that a solution based on Poisson statistics exists for cell survival. It exhibits exponential cell survival at high dose and a finite gradient of cell survival at vanishing dose, which is in agreement with experimental cell studies. The model fits the experimental data as well as the LQ model and is based on two free parameters. It was shown that cell survival can be described with a simple analytical formula on the basis of Poisson statistics. This solution represents in the limit of large dose the typical exponential behavior and predicts cell survival as well as the LQ model.

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Authors and Affiliations

  1. Science Faculty, Institute of Physics, University of Zürich, Zurich, Switzerland

    Jürgen Besserer & Uwe Schneider

  2. Radiotherapy Hirslanden, Witellikerstrasse 40, 8032, Zurich, Switzerland

    Jürgen Besserer & Uwe Schneider

Authors
  1. Jürgen Besserer
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  2. Uwe Schneider
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Correspondence to Uwe Schneider.

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Besserer, J., Schneider, U. Track-event theory of cell survival with second-order repair. Radiat Environ Biophys 54, 167–174 (2015). https://doi.org/10.1007/s00411-015-0584-7

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  • DOI: https://doi.org/10.1007/s00411-015-0584-7

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