>- cancer cells exist in human body and most of cancer cells can be eliminated by immune system

Yes, this is the basis of the cancer alternative therapy premise. It is amazing that scientist have actually figured this out, since it has been know by us less well informed folks for a long time.

>- scientists are researching a new kinds of vaccine to fight the cancer cells which has existed in people

This is not surprising as it is just another way to extract money.

Also, this is especially disturbing as I have been aware for many years, as others have that vaccines are a significant cause of cancer occurrence in the first place.

Instead, live and eat healthy, avoid things that cause cancer such as contaminated vaccines and many household chemicals, and you will have to worry far less about cancer as you will have a healthier immune system.