CCL2 and esophageal squamous cell carcinoma: Furthermore, CCR2 was found to be highly expressed in ESCC tumor tissues (Additional file 3: Figure S5I), and its high expression was indicative of poorer survival (Additional file 3: Figure S5J), similar to that of CCL2 (Additional file 3: Figure S5C&D), but in contrast to that of LINC00330 (Fig. 1I).