TNF and cancer: Grid sites occupied by healthy and cancer cells are sinks of oxygen, glucose, TGFα and TNFα.Cnutrientx,y,z(t+1)=Cnutrientx,y,z(t)+Dnutrient×ΔtΔS2(ΔCnutrientx,y,z(t))−Unutrientx,y,z(t)+Snutrientx,y,z(t)(3)Where: