ARG1 and neoplasm: Next, we evaluated the expression of functional genes in tumour‐infiltrating MDSCs isolated from PBS‐ or WBM‐treated xenograft tumours (Figure 2C), including surface markers (Ly6c, Ly6g), cytokines (S100a8, S100a9, Il1b, Il6, Tgfb), immune suppressive enzymes (Arg1, Arg2, Nos2), and transcription factors (Stat3).