The cyclophosphamide-induced leukemia mice are treated with S. latifolia polysaccharides orally, the recovery speed of leukocytes in the organs of the mice is accelerated, and the productions of interferon α (IFN-α), tumor necrosis factor α (TNF-α), and interleukin 6 (IL-6) and other cytokines are significantly increased (6). The gene discussed is TNF; the disease is leukemia.