Inquiry for Future Investigation

This cancer research project has been along, and very informational process, and like it says on correia seminar I do have a few unanswerd questions. First of all I could not find if there was a heart cancer. With the heart being the most important muscle and the most important organ in the body you would think that heart cancer would be a very big deal? The heart is also an easy target for a metastatisized cancer because any cancer carried in the blood would pass through the heart multiple times. Another question I had is if cancer cells kill each other if two seperate tumors came in contact. Lets say if a lung cancer tumor and a brain cancer tumor both matastisized to a pancreas, would the two cancers fight or combine? In other words does cancer recognize itself when it comes in contact, or does it just destroy anything around it. Another thing I was wondering is there really a chance for a cure. Cancer is in one sense just a mutated part of our own self, so to cure cancer we are going to have to kill off a part of ourselves. Then again there could be a way to just kill the cancerous cells, but only the future can tell. There is also just one question that bothered me, why is cancer not a large part of history? It really never had any hype until the twenty first centuary.