Explicit separation of growth and motility in a new tumor cord model

Craig J. Thalhauser, Tejas Sankar, Mark C. Preul, Yang Kuang

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We investigate a new model of tumor growth in which cell motility is considered an explicitly separate process from growth. Bulk tumor expansion is modeled by individual cell motility in a density-dependent diffusion process. This model is implemented in the context of an in vivo system, the tumor cord. We investigate numerically microscale density distributions of different cell classes and macroscale whole tumor growth rates as functions of the strength of transitions between classes. Our results indicate that the total tumor growth follows a classical von Bertalanffy growth profile, as many in vivo tumors are observed to do. This provides a quick validation for the model hypotheses. The microscale and macroscale properties are both sensitive to fluctuations in the transition parameters, and grossly adopt one of two phenotypic profiles based on their parameter regime. We analyze these profiles and use the observations to classify parameter regimes by their phenotypes. This classification yields a novel hypothesis for the early evolutionary selection of the metastatic phenotype by selecting against less motile cells which grow to higher densities and may therefore induce local collapse of the vascular network.

Original languageEnglish (US)
Pages (from-to)585-601
Number of pages17
JournalBulletin of mathematical biology
Volume71
Issue number3
DOIs
StatePublished - Apr 1 2009

Keywords

  • Mathematical models
  • Reaction-diffusion equations
  • Theoretical oncology
  • Tumor cords

ASJC Scopus subject areas

  • Neuroscience(all)
  • Immunology
  • Mathematics(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Environmental Science(all)
  • Pharmacology
  • Agricultural and Biological Sciences(all)
  • Computational Theory and Mathematics

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