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Proton radiotherapy commonly uses a fixed relative biological effectiveness (RBE) of 1.1. However, emerging evidence shows proton RBE varies, necessitating advanced models for accurate treatment planning.

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Radiobiology

Background:

  • Proton radiotherapy dose prescription often relies on a standard relative biological effectiveness (RBE) of 1.1.
  • This constant RBE value assumes proton biological efficacy is equivalent to photons, enabling the use of established photon treatment protocols.
  • However, this simplification overlooks emerging evidence of variable proton RBE.

Purpose of the Study:

  • To review existing models for predicting proton RBE variations.
  • To highlight the limitations of a single, constant RBE value in proton therapy.
  • To discuss the impact of RBE variability on treatment planning and patient outcomes.

Main Methods:

  • Review of experimental data on proton RBE.
  • Analysis of mechanistic models for RBE prediction.
  • Evaluation of factors influencing RBE (technical, tissue, patient-specific).

Main Results:

  • Experimental data indicate that proton RBE is not constant and varies significantly.
  • Factors such as beam energy, tissue type, and biological endpoints influence RBE.
  • Current models aim to predict these variations more accurately.

Conclusions:

  • A fixed RBE of 1.1 is an oversimplification for proton therapy.
  • Accurate RBE prediction is crucial for optimizing proton treatment planning.
  • Further research and model development are needed to account for RBE variability.