Commonly: Proteolytic (protein-digesting) Enzymes. Enzymes that are able to break down certain proteins, yet do not attack the beneficial proteins that make up the normal cells of the body. These proteolytic enzymes are said to have great value in fighting cancer as well as many other diseases. If the body were always capable of producing adequate proteolytic enzymes, it is possible that cancer would not develop. In theory, cancer cells have a type of protein coating that is destroyed by these proteolytic enzymes. When this protein is destroyed, the body’s white cells are able to attack the cancer cells and destroy them.