 T cells can penetrate virtually every biologic space and have the power to dispose of normal or malignant cells as seen in viral and autoimmune diseases and in the rare spontaneous remis-sions of cancer. However, T cells are easily tolerized to self or tumor antigens and immune surveillance has manifestly failed in every cancer that is clinically apparent. It is the goal of these studies to supply the specificities and affinities to patient T cells without regard for their endogenous T cell receptor repertoire, directed by antibody-defined recognition to kill malignant cells based on their expression of antigen. We will achieve this by preparing chimeric IgCD28TCR genes in mammalian expression vectors to yield designer T cells from normal patient cells. This extends the approach of Anderson, Rosenberg and co-workers to introduce or augment expression of genes in patients T cells in a therapeutic setting. 