Using the SimuLife tool, we were able to see that the model matched the behavior of a solid tumor in a number of ways: It developed an inner necrotic core, the branching of the blood vessels occurred more often as they approached the tumor, the VEGF molecules that were secreted from the tumor cells diffused and were distributed throughout space until reaching the blood vessels, the oxygen secreted from the endothelial cells was also diffused and finally reached and was consumed by the tumor cells. This evidence concerns the gene VEGFA and neoplasm.