MPO and neoplasm: Treatment of spleen M-MDSCs with RPMI-C + TES induced the expression of Arg1 (to 10-fold greater than tumor M-MDSCs) and Ccr1 mRNA but had no effect on the expression of Mpo, Nos2, Slc7a11, Spp1, or Vdr mRNA and reduced the expression of Stfa2l1 mRNA levels.