CoMoO4‐phosphomolybdic acid nanosheets (CPMNS) were gradually degraded to generate Co2+ and Mo6+ under the conditions of tumor micro‐acidic environment and high GSH concentration (Figure 3D).[41] Among them, Mo6+ had the ability to consume GSH to generate Mo5+ and reduce the expression of intracellular GPX4. This evidence concerns the gene GPX4 and neoplasm.