Figure 2

This figure represents the ratio of energy consumption vs. the volumetric growth of cancer.
The y-axis is the ratio between the energy used by a cancer cell, Q, related to the energy used by a normal, non-cancerous cell, Q0. The x-axis is the ratio between the volume of cancer V related to its initial value V0 at time 0. This result has been obtained by using Eq. (29). Note that a cancer cell and therefore tumor tissue consumes much more energy than normal tissue; moreover, the energy required by the cancer is proportional to the exponential tumor growth rate.