When DCs recognize this material, they use it to activate other cells of the immune system to mount an attack against that foreign material. In the Laboratory of Molecular Neuro-Oncology, each participant's DCs will be loaded with samples of their own tumor cells that were obtained at surgical resection. These tumor cells are killed in the laboratory using a special protocol, and then "fed" to the DCs. The DCs "eat" this material, and these "fed" DCs make up the vaccine.