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Summary of HER2 protein expression assessed by IHC and HER2 amplification assessed by ISH among SDC patients in the meta-analysis.
| Scores of HER2 protein expression | Rate of prevalence (95% CI) | Rate of prevalence of overall HER2 amplification by ISH (95% CI) |
|---|---|---|
| IHC0 | 31% (21-44) | 39% (95% CI: 31-49) |
| IHC1+ | 10% (6.4-15) | |
| IHC2+ | 14% (8.9-20) | |
| IHC3+ | 37% (28-47) |
