Figure 1

The simulation indicated that RTOP (return to origin probability) gradually approached as low level as the tumor increased ( x ₁  = 0.5 to 0.7 mm) or as time passed (0 to 1000 days) (D = 10^-6/ d · mm²). The fractal factors were α = 0.4 and β_1,2,3 = 0.9.