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The correlation between high-level amplification in HER2 copy numbers of ctDNA and best objective response.
| Best Objective Response |
||||
|---|---|---|---|---|
| PR | SD | |||
| plasma HER2 copy number | high-level amplification | 19 | 0 | p=0.010 |
| without high-level amplification | 15 | 7 | ||
HER2: human epidermal growth factor receptor 2; ctDNA: circulating tumor DNA; PR: partial response; SD: stable disease.
