My 4 year-old-son has high IgE levels in blood. Could the body be reacting to cancer?

Consider allergy. There are five types of antibodies in the blood. The other word for antibody is immunoglobulin, or ig. The five types of antibody are g (keeps you immune), a (protects your surfaces such as nose and gut from infection), m (kills currently active infections), d (unknown function), and e (worm infections and allergies. So the e type is ige and when it is up think of allergies or worms.