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Cover story: Compared with traditional ADC T-Dxd, Wang et al. report novel anti-HER2 nanobody-drug conjugates (HER2-NDCs) with enhanced tumor distribution, increased BBB permeability, reduced systemic exposure, and improved tumor inhibition and antitumor immune response. This highly differentiated PK/PD profile will benefit treatment outcome. Doi: 10.1038/s41401-025-01634-3.