Abstract
More than a decade after the drug trastuzumab (Herceptin) won approval in 1998, scientists still disagree over how to identify breast cancer patients for treatment. Trastuzumab targets human HER2, which contributes to poor outcomes in breast cancer when amplified. HER2-positive cases account for up to 20% of all newly diagnosed breast cancers, and there is no argument about trastuzumab's efficacy in these cases.

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