This paper presents a simulation model of the disease cancer. Various aspects of the disease are noted and changes in these aspects are modeled to indicate their resemblance to real-life situations. As with any model, its validity depends on how well it conforms with experimental evidence, and how useful it is as a predictor of future events. It is hoped that the model will stimulate sufficient interest that such experiments will be conducted, with the ultimate goal being a better approach to the control of the disease.