IL6 and neoplasm: Proinflammatory cytokines such as interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and interleukin -1beta (IL-1β), which are released from tumor-infiltrating leukocytes, can activate signal transducers and activators of transcription protein 3 (STAT3), which induces immunosuppression that favors tumor cell proliferation[8,9].