Open AccessModel‐Based Evaluation of Radiation and Radiosensitizing Agents in Oncology
Author(s) -
Cardilin Tim,
Almquist Joachim,
Jirstrand Mats,
Zimmermann Astrid,
El Bawab Samer,
Gabrielsson Johan
Publication year - 2018
Publication title -
cpt: pharmacometrics and systems pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.53
H-Index - 37
ISSN - 2163-8306
DOI - 10.1002/psp4.12268
Subject(s) - radiosensitizer , radiation therapy , medicine , radiation oncology , oncology , nuclear medicine , combination therapy , cancer research , medical physics
Radiotherapy is one of the major therapy forms in oncology, and combination therapies involving radiation and chemical compounds can yield highly effective tumor eradication. In this paper, we develop a tumor growth inhibition model for combination therapy with radiation and radiosensitizing agents. Moreover, we extend previous analyses of drug combinations by introducing the tumor static exposure (TSE) curve. The TSE curve for radiation and radiosensitizer visualizes exposure combinations sufficient for tumor regression. The model and TSE analysis are then tested on xenograft data. The calibrated model indicates that the highest dose of combination therapy increases the time until tumor regrowth 10‐fold. The TSE curve shows that with an average radiosensitizer concentration of 1 . 0 μ g / m L the radiation dose can be decreased from 2 . 2 G y to 0 . 7 G y . Finally, we successfully predict the effect of a clinically relevant treatment schedule, which contributes to validating both the model and the TSE concept.