Hopf bifurcation in a solid avascular tumour growth model with two discrete delays

In this paper the model of solid, avascular, uniformly proliferating tumour growth with two independent time delays is presented and analysed. The model considers two main cellular processes: proliferation and apoptosis. The aim of this paper is to investigate the influence of time delays on the Hopf bifurcation when one of delays is used as a bifurcation parameter.