CXCR2 and neoplasm: Blocking the CXCR2 chemokine signaling using anti-CXCR2 mAb was reported to disrupt the CXCR2-mediated tumor trafficking of MDSCs, and improved the therapeutic efficacy of anti-PD1 therapy.674 Other approaches inhibiting the infiltration of MDSCs in patients include the inhibition of galectin-3 by GR-MD-02 and the inhibition of CCR2 by CCX872.675,676 In general, targeting cytokine or chemokines related to the expansion and infiltration of MDSCs has been shown to significantly improve the efficacy of anti-tumor immunotherapy.