Blocking of cell-mediated tumor immunity by sera from patients with growing neoplasms

Blood lymphocytes from tumor patients can specifically destroy cultivated neoplastic cells of the same histological origin as the tumors of the lymphocyte donors, irrespective of whether or not the donors have symptoms of growing tumor. The purpose of the present study was to investigate whether sera from tumor patients could block the cytotoxic effect of lymphocytes immune to the specific antigens of the respective neoplasms. A wide variety of...