Normal C57BL/6 mice are inoculated with 3LL SC in the right hindflank (Table 1, experiment 2). CD4⁺ or CD8⁺ subsets were given at 5 × 10⁷ cells/injection. Median tumor volumes are shown. A 60% cure rate was observed in the CD4-treated group. No cures were obtained in CD8- or Cy-treated animals. There were five mice per treatment group.