When a cell becomes carcinogenic, it begins to multiply, giving rise to other carcinogenic cells. During the first stages of cancer cell proliferation, the body can resist using some white blood cells (phagocytes). These cells recognize carcinogenic cells, just as in the case of microbes and fungi, and destroy them. Thus, there is a race in the body between the immune system and cancer cells. If cancer cells win this race, then cancer develops. For this reason, patients with reduced immunity (as in AIDS) are at increased risk of infections, but also of malignant tumors. The proliferation of these cells will never stop.
