Although vaccines developed to help the immune system fight tumors appear to have an impact against early-stage tumors, they have little if any success in slowing the growth of tumors in later stages. Now researchers writing in the Feb. 1, 2004 issue of The Journal of Immunology identify abnormalities in the immune system’s T cells, provide insight into their origin, and describe how these defects can be prevented and “repaired” in animal experiments.
