IL6 and cancer: myCAFs are located in direct proximity to cancer cells and have high α-SMA expression; iCAFs are located far more distantly from neoplastic cells and express less α-SMA but secrete more IL-6 and other inflammatory factors (e.g., IL-8, IL-11 and LIF), and they might participate in immune suppression and tumor cachexia by stimulating the STAT3 signaling pathway.