Our approach, on the other hand, is very simple and direct. A. Most of the time, it does. What we call clinical cancers are the failures of the immune system. You have to understand that there are two basic kinds of immunity. These are like guided missiles that home in on and destroy foreign substances.
Humoral immunity is especially effective against small entities such as viruses.
Q. Immunity depends on a sophisticated recognition system. This flag is called the histocompatibility antigen. A. Normally, it doesn't. But evolutionary pressures are at work. Some malignantly transformed cells acquire the means to evade destruction.