Abstract: | Peripheral blood leukocytes from four patients with Burkitt's lymphoma (BL) were studied for immunological reactions with lymphoblastoid culture line cells. In all four cases peripheral blood leukocytes could reproducibly be stimulated with autochthonous cultured cells derived from tumor biopsies. Stimulation could be accomplished despite the inability of the unstimulated lymphocytes to mediate a cytotoxic response. Leukocytes which have been stimulated with the autochthonous cells displayed strong colony inhibiting activity against the autochthonous BL-derived target cell, but considerably less activity against two non-BL-derived target cells. Autochthonous fibroblasts were ineffective as stimulator cells. |