ARG1 and neuroblastoma: As shown in Figure 1(a), the expression of IL-10 mRNA in BM samples was significantly higher in NB patients (2−ΔCt: 1.28 × 10−3 ± 1.32 × 10−3) than in controls (2−ΔCt: 0.41 × 10−3 ± 0.26 × 10−3; P = 0.002), whereas the expression of FOXP3, ARG-1, and CD163 mRNAs was similar between the two groups.