We therefore analyzed the peripheral blood two weeks after BMT and found that the percentages and numbers of CD4+ and CD8+ T cells in the Gr-1 group were significantly higher than those in the TT and BMT groups (Fig. 3A and B), suggesting that the administration of Gr-1 Ab contributed to the tumor suppression by increasing the percentage and number of T cells. This evidence concerns the gene CD4 and neoplasm.