Niu et al. suggested that polysaccharides isolated from Bletilla ochracea Schltr obviously suppressed tumor xenograft growth in vivo by promoting CD4+ T cell proliferation in the spleen of the tumor-bearing mice, thus indicating that Bletilla ochracea Schltr could be a potential immunomodulatory agent in cancer treatment [25]. The gene discussed is CD4; the disease is neoplasm.