Biodistribution of human MHC non-restricted TALL-104 killer cells in healthy and tumor bearing mice

The human cytotoxic T cell line TALL-104 displays potent anti-tumor effects in animals with spontaneous and induced malignancies. We investigated the biodistribution of TALL-104 cells in tumor bearing and healthy mice. In-111 -labeled TALL-104 cells, injected intravenously, localized primarily in the lungs for the first 2 h, and redistributed to liver, spleen, and kidneys i n the following 24 h both in immunodeficient and immunocompetent mice. TALL -104 cells consistently accumulated in the tumor and at sites of metastases . In animals injected with free In-111-oxine, most of the radioactivity rem ained in the blood pool with no significant organ accumulation. These data support the tumor homing properties of TALL-104 cells, information which is crucial to their therapeutic efficacy in forthcoming clinical trials.