In order to determine the effects of stem cell proliferation and CCR5+ cell migration on the overall tumor growth, we performed simulations varying the stem cell proliferation rate between 0.1 and 0.4 per day and the CCR5+ migration rate between 0.8 and 5.8 μm per hour, in accordance with experimental data, see Tables 1-3. Here, CCR5 is linked to neoplasm.