TNF and myelodysplastic syndrome: In contrast, CD68‐positive cells were rarely found in the bone marrow of patients with AML.23 Pathological examination revealed that the expression of TNF receptor‐I and FAS was upregulated in hematopoietic cells while Tumor necrosis factor alpha (TNFα) and FAS‐L were found to be prominently overexpressed in MDS bone marrow macrophages.