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Bulletin of Mathematical Biology

, Volume 69, Issue 8, pp 2737–2772 | Cite as

Modelling the Role of Angiogenesis and Vasculogenesis in Solid Tumour Growth

  • I. J. StamperEmail author
  • H. M. Byrne
  • M. R. Owen
  • P. K. Maini
Original Article

Abstract

Recent experimental evidence suggests that vasculogenesis may play an important role in tumour vascularisation. While angiogenesis involves the proliferation and migration of endothelial cells (ECs) in pre-existing vessels, vasculogenesis involves the mobilisation of bone-marrow-derived endothelial progenitor cells (EPCs) into the bloodstream. Once blood-borne, EPCs home in on the tumour site, where subsequently they may differentiate into ECs and form vascular structures.

In this paper, we develop a mathematical model, formulated as a system of nonlinear ordinary differential equations (ODEs), which describes vascular tumour growth with both angiogenesis and vasculogenesis contributing to vessel formation. Submodels describing exclusively angiogenic and exclusively vasculogenic tumours are shown to exhibit similar growth dynamics. In each case, there are three possible scenarios: the tumour remains in an avascular steady state, the tumour evolves to a vascular equilibrium, or unbounded vascular growth occurs. Analysis of the full model reveals that these three behaviours persist when angiogenesis and vasculogenesis act simultaneously. However, when both vascularisation mechanisms are active, the tumour growth rate may increase, causing the tumour to evolve to a larger equilibrium size or to expand uncontrollably. Alternatively, the growth rate may be left unaffected, which occurs if either vascularisation process alone is able to keep pace with the demands of the growing tumour.

To clarify further the effects of vasculogenesis, the full model is also used to compare possible treatment strategies, including chemotherapy and antiangiogenic therapies aimed at suppressing vascularisation. This investigation highlights how, dependent on model parameter values, targeting both ECs and EPCs may be necessary in order to effectively reduce tumour vasculature and inhibit tumour growth.

Keywords

Tumour growth Angiogenesis Vasculogenesis Endothelial progenitor cell Therapy 

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Copyright information

© Society for Mathematical Biology 2007

Authors and Affiliations

  • I. J. Stamper
    • 1
    Email author
  • H. M. Byrne
    • 1
  • M. R. Owen
    • 1
  • P. K. Maini
    • 2
    • 3
  1. 1.Centre for Mathematical Medicine, School of Mathematical SciencesUniversity of NottinghamNottinghamUK
  2. 2.Centre for Mathematical Biology, Mathematical InstituteUniversity of OxfordOxfordUK
  3. 3.Oxford Centre for Integrative Systems Biology, Dept. of BiochemistryOxfordUK

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