Cancer alone with no factors involved in a petri dish is a sitting duck - anything can come and kill it. Now put it in a body and add causative factors, diet, environment, etc and you have yourself a problem. There is more to healing from cancer than just killing it and there is more to killing the cancer that hitting it with poison. Cancer is whole body issue, you have to focus on the cause, balance the body, detox the body and kill the cancer, and detox the die off.
Not easy but it is not so difficult you cannot cure cancer. Mainstream wants it to be chronic and not to cure it.