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Non-enzymatic chitinase-3 like-protein-1 （CHI3L1） belongs to glycoside hydrolase family 18. CHI3L1 is synthesized and secreted by macrophages, neutrophils, synoviocytes, chondrocytes, fibroblast-like cells, smooth muscle cells, and tumor cells. It plays a major role in tissue injury, inflammation, tissue repair, and remodeling responses. CHI3L1 has been strongly associated with diseases including asthma, arthritis, sepsis, diabetes, liver fibrosis, and coronary artery disease. Moreover, CHI3L1 has been shown to be overexpressed in a wealth of both human cancers and animal tumor models. CHI3L1 signaling plays a critical role in cancer cell growth, proliferation, invasion, metastasis, angiogenesis, activation of tumor-associated macrophages, and Th2 polarization of CD4+ T cells.