Biology – Quantitative Biology – Tissues and Organs
Scientific paper
2005-12-09
Biology
Quantitative Biology
Tissues and Organs
24 pages, 8 figures; presented to ARCC workshop "The Modeling of Cancer Progression and Immunotherapy"
Scientific paper
A complete parametric analysis of dynamic regimes of a conceptual model of anti-tumor virus therapy is presented. The role and limitations of mass-action kinetics are discussed. A functional response, which is a function of the ratio of uninfected to infected tumor cells, is proposed to describe the spread of the virus infection in the tumor. One of the main mathematical features of ratio-dependent models is that the origin is a complicated equilibrium point whose characteristics crucially determine the main properties of the model. It is shown that, in a certain area of parameter values, the trajectories of the model form a family of homoclinics to the origin (so-called elliptic sector). Biologically, this means that both infected and uninfected tumor cells can be eliminated with time, and complete recovery is possible as a result of the virus therapy within the framework of deterministic models
Berezovskaya Faina S.
Karev Georgy P.
Koonin Eugene V.
Novozhilov Artem S.
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