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This is a representative image of Her2 chromogenic in situ hybridization test performed on the chest wall biopsy. Average number of HER2 gene copies per cell observed: 4.85. Average copy number of chromosome 17 per cell: 2.25. HER2/CEP17 ratio: 2.18. The ratio of HER2 signal to chromosome 17 centromere signal observed ≥2.0, hence HER2 gene amplification is considered positive.
