CD34 and cancer: It has been shown that 5-Azacytidine upregulates tumor suppressor genes by demethylation35, 36 and also CTAs that are known targets for immunological recognition of cancer cells are upregulated.8, 9, 10 We show here that CD34 myeloid cells (as a surrogate marker for malignant blasts) were significantly better recognized by host T cells after 5-Azacytidine treatment.