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Trastuzumab deruxtecan (DS-8201a) is an anti-human epidermal growth factor receptor 2 (HER2) antibody-drug conjugate (ADC).

Trastuzumab deruxtecan (1 pM-10 nM; 5 days) inhibits the growth of HER2‐positive KPL‐4 cells, with an IC ₅₀ of 109.7 pM.
Trastuzumab deruxtecan (10 nM; 5 days) shows bystander killing effects in HER2‐negative MDA‐MB‐468 cells.

Trastuzumab deruxtecan (3 mg/kg; a single iv) shows antitumor activity against not only HER2‐positive tumors but also HER2‐negative tumors under the co‐inoculated condition.

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