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The concordance of HER2 status between plasma ctDNA and primary tissue.
| Tissue HER2 status |
||||
|---|---|---|---|---|
| positive | negative | |||
| plasma HER2 amplification in ctDNA | positive | 37 (77.1%) | 2(4.2%) | χ2 = 52.901 (p < 0.001) |
| negative | 11(22.9%) | 46(95.8%) | ||
HER2: human epidermal growth factor receptor 2; ctDNA: circulating tumor DNA.
