Problem:

Question: Could cancer be in itself a evolutionary process?

Question: Maybe in some way could it be a process of variation?

Question: Would this idea be completely without support, if so, why?

I don't mean that each case would lead to evolution, but that within an entire group of organisms, it could lead to case of of individuals developing ways to resist what caused the cancer, maybe in cases of individuals beating the cancer or in cases of successive generations of off spring from individuals with cancer?

Question: Could it be possible that in rare cases it could lead to the development of new organs or specialized cells?

Please help me to get all the answers of these questions.