For validation we scored the percentage of segmented neutrophils on BM cytospins from patients with localized (n = 9) and infiltrated (n = 12) neuroblastoma by imaging mass cytometry (IMC; Iridium-intercalator = nuclear; CD15 = granulocytic; Fig. 8b, c, Supplementary Fig. 9b). Here, FUT4 is linked to neuroblastoma.