I am a computer science student and I'm interested in algorithmic aspects of cancer! Once I heard that there exist more bacteria in human body than our own cells, I wondered that why bacteria, which divide faster than cell bodies, do not cause something like cancer in body? Isn't it evolutionary more probable for bacteria to gain aggressive properties and invade human tissues? Or maybe is it the case that bacteria really produce some lethal colonies like cancers in the body?
One difficulty with cancers is that cancer is a very complex disease because of it's intra-tumor and inter-tumor heterogeneity. Isn't it more probable for bacteria to cause extremely heterogenous infections with regard to existing simple evolutionary models which are used to describe cancer?