ERBB2 and neoplasm: In 2011, Wang exhibited specific targeting and localization in HER2‐overexpressing breast cancer cells and tumor tissue due to conjugating Herceptin with Au NCs stabilized by bovine serum albumin (Au NCs‐Her).[92] In 2014, our team synthesized the radiosensitizer GSH‐Au25 NCs (∼2.4 nm), which could significantly reduce tumor volume.[93] In 2019, atomic‐precision gold clusters (Au25 (SG)18) were designed by our team (Figure 3D).