Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/11004
Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: Modeling and optimization of combined cytostatic and cytotoxic cancer chemotherapy
Authors: Villasana, Minaya
Ochoa, Gabriela
Aguilar, Soraya
Contact Email: gabriela.ochoa@cs.stir.ac.uk
Keywords: Evolutionary algorithms
Evolution strategies
Singular optimal control
Tumor model
Delay differential equation system
Cytostatic drug
Cytotoxic drug
Combined chemotherapy
Cancer chemotherapy
Issue Date: Nov-2010
Publisher: Elsevier
Citation: Villasana M, Ochoa G & Aguilar S (2010) Modeling and optimization of combined cytostatic and cytotoxic cancer chemotherapy, Artificial Intelligence in Medicine, 50 (3), pp. 163-173.
Abstract: Objectives: This study extends a previous mathematical model of cancer cytotoxic chemotherapy, which considered cycling tumor cells and interactions with the immune system, by incorporating a different type of drug: a cytostatic agent. The effect of a cytostatic drug is to arrest cells in a phase of their cycle. In consequence, once tumor cells are arrested and synchronized they can be targeted with a cytotoxic agent, thus maximizing cell kill fraction and minimizing normal cell killing. The goal is to incorporate the new drug into the chemotherapy protocol and devise optimal delivery schedules. Methods: The problem of designing efficient combined chemotherapies is formulated as an optimal control problem and tackled using a state-of-the-art evolutionary algorithm for real-valued encoding, namely the covariance matrix adaptation evolution strategy. Alternative solution representations and three formulations of the underlying objective function are proposed and compared. Results: The optimization problem was successfully solved by the proposed approach. The encoding that enforced non-overlapping (simultaneous) application of the two types of drugs produced competitive protocols with significant less amount of toxic drug, thus achieving better immune system health. When compared to treatment protocols that only consider a cytotoxic agent, the incorporation of a cytostatic drug dramatically improved the outcome and performance of the overall treatment, confirming in silico that the combination of a cytostatic with a cytotoxic agent improves the efficacy and efficiency of the chemotherapy. Conclusion: We conclude that the proposed approach can serve as a valuable decision support tool for the medical practitioner facing the complex problem of designing efficient combined chemotherapies.
Type: Journal Article
URI: http://hdl.handle.net/1893/11004
DOI Link: http://dx.doi.org/10.1016/j.artmed.2010.05.009
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Universidad Simon Bolivar
Computing Science - CSM Dept
Universidad de Carabobo, Venezuela

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