Fig 16. Validation of the PDE model (b₁ = 0, V and a constant).

Evolution of the averaged protumor cells concentration ${\mu }_{c_r}={\int }_{\Omega }{c}_r\mathrm{d}x$ (square, left axis), and of the immune strength ${\overline{\mu }}_c$ (dashed, right axis) for several values of the division rate a. For small a (fig. (a)), the concentration of antitumor immune cells reaches the equilibrium, and the concentration of protumor cells is damped; for large a (fig. (b)), the equilibrium does not establish and the concentration of protumor immune cells keeps growing.