MPO and neoplasm: We found treatment with MPO inhibition via verdiperstat had a similar effect on tumor burden (Fig. 3A, 0.90 g after verdiperstat versus 1.26 g with control; p = 0.04) and intratumoral luminol bioluminescence as HCQ, reflective of MPO activity (Fig. 3B 1.24 × 103 after verdiperstat versus 1.67 × 104 with control; p = 0.01).