Authors:	Ressing, Meike Becker, Cornelia Müller, Christian Mahmoudpour, Seyed Hamidreza Calaminus, Gabriele Langer, Thorsten Erdmann, Friederike Voigt, Mathias Kaiser, Melanie Kaatsch, Peter Blettner, Maria Spix, Claudia
Title:	Equivalent doses for anticancer agents used in pediatric oncology : a literature review and evaluation of a novel approach for conversion factors
Online publication date:	17-Aug-2023
Year of first publication:	2023
Language:	english
Abstract:	Background Epidemiological research on late effects of therapy shows the necessity to aggregate chemotherapy agents to substance classes. This requires using conversion factors by substance classes. Aims The aim of this study was to identify previously used conversion factors from the literature, to present a novel approach for additional factors, and to compare these approaches. Methods and Results A literature review was performed, which identified two main principles of deriving conversion factors: effect-equivalence and equimolar. Thirty-five articles presenting effect equivalence-based factors in the widest sense were found in the literature. Ten articles presented the equimolar approach which can be applied to almost all chemotherapy substances. Based on a comprehensive list of treatment protocols used in German pediatric oncology, we derived alternative conversion factors from typical doses. We compared the conversion factors using Pearson correlation coefficients and linear regression. At least two types of conversion factor were available for each of the 49 substances included. The equivalent effect-based and the typical dose-based factors were highly correlated with a regression coefficient close to 1. The equimolar factors are independent. Conclusions For substances for which no conversion factor based on some type of effect equivalence has been published so far, a factor based on a typical doses-approach may be used in epidemiological late effects research. Doses aggregated based on the equimolar approach may not be compatible with doses aggregated based on equivalent effects.
DDC:	610 Medizin 610 Medical sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 04 Medizin
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9415
Version:	Published version
Publication type:	Zeitschriftenaufsatz
Document type specification:	Scientific article
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/4.0/
Journal:	Cancer reports 6 5
Pages or article number:	e1811
Publisher:	Wiley
Publisher place:	Medford, MA
Issue date:	2023
ISSN:	2573-8348
Publisher DOI:	10.1002/cnr2.1811
Appears in collections:	DFG-491381577-G