Similar to U87MG tumors, histological analyses of U251-NG2 tumors also revealed that both mAb9.2.27 and NK+mAb9.2.27 treated tumors exhibited extensive tissue necrosis, packed with leucocytes (supplementary Fig. 3A), and more abundant MPO expressing cells were present in the NK+mAb9.2.27 treated tumors compared to NK cell and mAb9.2.27 monotherapy, as well as and control tumours (One-way ANOVA 4.07, df=3, p<0.0001, n=5), (supplementary Fig. 3A and 3B). Here, MPO is linked to neoplasm.