CXCL1 and neoplasm: While IL-1α KO tumors contained lower levels of chemokines, such as CCL2 and CXCL1/2/3, known to attract MDSCs into the tumor [10,57,60], they showed higher expression of CCL5, CXCL9/10, which could attract T lymphocytes and NK cells [61] (Figure 4I).