Fig 5. The cellular automaton.

(a) A grid representing the cellular automaton during the growth of a tumor. The tumor cells are shown in red, while the remaining spots are occupied by healthy cells. The vertical black stripes in the boundary of the square domain represent the vessels from which nutrients diffuse, and periodic boundary conditions are considered in the remaining part of the boundary. (b) Once a tumor is grown up to a certain size, immune cells are placed around the tumor (green) and the lysis of the tumor is registered until it is totally eradicated. During this second step, the dynamics of the tumor is freezed, since we are only interested in the lysis.