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Optimal Bang-Bang Controls for a Two-Compartment Model in Cancer Chemotherapy

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Abstract

A class of mathematical models for cancer chemotherapy which have been described in the literature take the form of an optimal control problem over a finite horizon with control constraints and dynamics given by a bilinear system. In this paper, we analyze a two-dimensional model in which the cell cycle is broken into two compartments. The cytostatic agent used as control to kill the cancer cells is active only in the second compartment where cell division occurs and the cumulative effect of the drug is used to model the negative effect of the treatment on healthy cells. It is shown that singular controls are not optimal for this model and the optimality properties of bang-bang controls are established. Specifically, transversality conditions at the switching surfaces are derived. In a nondegenerate setting, these conditions guarantee the local optimality of the flow if satisfied, while trajectories will be no longer optimal if they are violated.

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Authors and Affiliations

  1. Department of Mathematics and Statistics, Southern Illinois University at Edwardsville, Edwardsville, Illinois

    U. Ledzewicz (Professor)

  2. Department of Systems Science and Mathematics, Washington University, St. Louis, Missouri

    H. Schättler (Associate Professor)

Authors
  1. U. Ledzewicz
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  2. H. Schättler
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Ledzewicz, U., Schättler, H. Optimal Bang-Bang Controls for a Two-Compartment Model in Cancer Chemotherapy. Journal of Optimization Theory and Applications 114, 609–637 (2002). https://doi.org/10.1023/A:1016027113579

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