CD8A and neoplasm: Primary and Met2 cells were also analyzed by FACS for the expression of Ep-CAM (epithelial cell marker) and CD11b (myeloid cell marker highly expressed on the surface of monocytes/macrophages, and some CD8+ cytotoxic T cells) to rule out the possibility that increased inflammatory cytokine/chemokine production observed in the Met2 cells was due to contaminating monocytes, macrophages, and tumor-infiltrating lymphotyes.