Answer
Trastuzumab targets HER2, so treatment is intended only when a validated tumour test confirms HER2 overexpression or gene amplification.
Sources for this answer
- Herceptin 600 mg Solution for Injection in Vial — Current selected SmPCemc · Summary of Product Characteristics
- Herceptin 150mg Powder for concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics
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