Cancer cells are cells that grow and divide at an unregulated, quick pace. Although
cancer cells can be quite common in a person, they are only malignant when the other cells (particularly
natural killer cells) fail to recognize and/or destroy them. In the past a common belief was that cancer cells failed to be recognized and destroyed because of a weakness in the
immune system. However more recent research has shown that the failure to recognize cancer cells is caused by the lack of particular co-stimulated molecules that aid in the way
antigens react with
lymphocytes.