After the research in several years, scientists were aware of distinguishing tumor cells and antagonizing the cancer more and more. These important breakthrough caused highly attention and anticipation.

Immune system is made up of immune cells and organs, which is a vital defending mechanism against foreign pathogen, bacteria, virus and even cancer. Immune cells act super vital characters in immune system. They can engulf the foreign pathogen; besides, they will set up an "adaptive immune function" to insure the same foreign pathogen will be eliminated when it invades again.