Figure 8.

Performance of the proposed therapy term. Evolution of the tumor radius (A) and concentration of effector cells (B) by considering the external immuno-modulatory function (24) with parameters ${\displaystyle \alpha =-0.6}$ and ${\displaystyle \gamma =100}$ (C) Energy of the system of equations (25)–(26) with ${\displaystyle \alpha =-0.6}$ and ${\displaystyle \gamma =100}$. Evolution of the tumor radius (D) and concentration of effector cells (E) by initializing the system away from the spiral point L and considering the external immuno-modulatory function with ${\displaystyle \alpha =-25}$ and ${\displaystyle \gamma =100}$. (F) Energy of the system of equations (25)–(26), with ${\displaystyle \alpha =-25}$ and ${\displaystyle \gamma =100}$, initialized away from the spiral point L.