IL6 and Sepsis: Hence, circulating levels of procalcitonin, C-reactive protein, interleukin (IL)-1, IL-6, IL-8, IL-10, tumor necrosis factor alpha (TNF-α), Fas-ligand, and monocyte chemoattractant protein 1 (MCP-1) have all been highlighted as potential markers of sepsis [6]–[16].