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Interleukin 6 （IL-6） is an interleukin that acts as both a pro-inflammatory cytokine and an anti-inflammatory myokine. In addition, osteoblasts secrete IL-6 to stimulate osteoclast formation. Smooth muscle cells in the tunica media of many blood vessels also produce IL-6 as a pro-inflammatory cytokine. Anti-IL-6 therapy was initially developed for treatment of autoimmune diseases, but due to the role of IL-6 in chronic inflammation, IL-6 blockade was also evaluated for cancer treatment. IL-6 was seen to have roles in tumor microenvironment regulation, production of breast cancer stem cell-like cells, metastasis through down-regulation of E-cadherin, and alteration of DNA methylation in oral cancer. Advanced/metastatic cancer patients have higher levels of IL-6 in their blood.