Moreover, immunofluorescence staining of NB tissues detected that most of the FABP4 positive staining was localized in CD68+ macrophages, and the co‐expression level of FABP4 and CD68 increased gradually (Figure 1G), indicating that the number of infiltrated macrophages might have a positive correlation with FABP4 in NB. This evidence concerns the gene CD68 and neuroblastoma.