IL6 and gastric cancer: Altered levels of IL-6 have been shown to be associated with various diseases and conditions, such as Alzheimer’s disease [29], major depressive disorders [30], cardiovascular diseases [31], cancers such as breast, prostate and gastric cancers [32], and autoimmune diseases, such as rheumatoid arthritis, chronic inflammatory proliferative disease and systemic lupus erythematosus [33].