CCL2 and gastric cancer: We further examined the corelationship between CCL2 expression and prognosis of HER2-positive GC patients from Gene Expression Omnibus using Kaplan-Meier Plotter tools.22 The results showed HER2-positive GC patients with higher CCL2 expression had a poorer OS (p<0.001), first progression (p=0.009) and postprogression survival (PPS) (p=0.008) (online supplemental figure 1A–C).