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Isoeffect relationships for fractionated biologically targeted radiotherapy
1Radiation Oncology Research Group, Beatson Oncology Centre, Belvidere Hospital, Glasgow, U.K.
Summary
This study presents a method for analyzing biologically targeted radiotherapy (BTR) effects on normal tissues. The approach calculates extrapolated response doses (ERDs) to account for fractionated treatments and recovery between doses.
Area of Science:
- Radiation Oncology
- Medical Physics
- Pharmacokinetics
Background:
- Fractionated Biologically Targeted Radiotherapy (BTR) requires methods to analyze biological effects on normal tissues.
- Existing models may not fully account for short time gaps between administrations.
Purpose of the Study:
- To develop and describe a method for analyzing the biological effects of fractionated BTR on normal tissues.
- To extend the linear-quadratic (LQ) model to accommodate short time intervals between BTR administrations.
Main Methods:
- Utilized an extended linear-quadratic (LQ) model.
- Assumed linear pharmacokinetics and simple exponential decay for dose-rate profiles.
- Calculated extrapolated response doses (ERDs) for inter-administration periods.
- Incorporated corrections for incomplete recovery between fractions.
Main Results:
- The method calculates overall ERD by summing ERDs for individual periods and recovery corrections.
- The analysis does not account for cellular repopulation.
- A numerical example illustrates the application of the method.
Conclusions:
- The described method provides a clinically relevant approach for assessing normal tissue effects in fractionated BTR.
- This analysis is crucial for optimizing BTR protocols and minimizing toxicity.