CAT and neoplasm: In addition, enzymatically active methods as the use of catalase on the erythrocyte membrane [116] could metabolize endogenous hydrogen peroxide from the tumor as a strategy for tumor eradication [117]; thus, the cell membrane-engineered NPs effectively inhibited tumor growth (e.g., breast cancer metastasis in vitro and in vivo) by blocking angiogenesis (a process involved in tumor dissemination).