CXCL1 and neoplasm: We stimulated WT-GSCs with 10 ng/mL TNF-α for 48 hrs and performed qPCR for Cxcl1, Cxcl2, Cxcl3, and Cxcl5. We show that TNF-α increases the expression of neutrophil recruitment chemokines by tumor cells (Supplementary Fig. 26), which can further contribute to the neutrophil influx in qMCP-deficient tumors.