CD68 (Kp-1)

Anti-CD68 marks cells of monocyte/macrophage lineage. This antibody is capable of staining monocytes, Kupffer cells, osteoclasts, granulocytes and their precursors; lymphomas are negative or show a few granules. This antibody may be useful for the identification of myelomonocytic and histiocytic tumors. Anti-CD68 may help to distinguish malignant fibrous histiocytoma from other pleomorphic sarcomas. However, since this detects a formalin-resistant epitope that may be associated with lysosomal granules, other lysosome-rich cells may also stain.