Levels of Interleukin (IL)-6 and Monocyte chemotactic protein (MCP)-1 in supernatants of 24-hours in vitro endotoxin (1 μg/ml lipo-poly saccharide (LPS))-stimulated purified monocytes from HNSCC patients and control patients. Cultures were either supplied with autologous serum (AS) or serum free medium (SFM). Bars represent means ± SEM of supernatant levels. (LPS-stimulated – baseline levels: IL-6 SFM/AS & MCP-1 SFM. Baseline – LPS-stimulated: MCP-1 AS). Statistics by students' t-test.