Human: I've been diagnosed with cancer and my doctor says that I need to start chemotherapy immediately. Is this necessary? Assistant: 
It depends on the type of cancer you have, as well as your overall health and medical history. If it is a serious form of cancer that has spread to other parts of your body, then it may be necessary to begin treatment right away. However, if you are feeling healthy and the cancer appears to be localized in one area, it might not be necessary to undergo immediate treatment. You should discuss your situation with your doctor to determine what course of action is best for you.