Figure 3. Simulations of the evolution of melanoma under T-cell therapy in the stochastic model for a fixed set of parameters.

The graphs show the number of individuals divided by 200 versus time. Two scenarios are possible for therapy with T-cells of one specificity: (a) T-cells z_x survive and the system is attracted to , or (b) T-cells z_x die out and the system is attracted to P_xy00. Three additional scenarios are possible for therapy with T-cells of two specificities: (d) T-cells z_x and z_y survive and the system stays close to , (e) T-cells z_x die out and the system is attracted to , (f) the tumour is eradicated (corresponding to P₀₀₀₀₀). (c) Transition between cases (a,d).