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Table 2 Comparison of HER2 status between primary gastric adenocarcinomas and cell blocks of malignant effusions

From: Discordance in HER2 status between primary gastric adenocarcinoma tumors and cells from the corresponding malignant effusions

HER2 IHC score in the primary gastric adenocarcinoma tissue HER2 IHC score in the malignant effusion cell blocks Total
Negative Positive
0 1 2 3
Negative 0 24 4 0 1* 29 (64.4%)
1 5 1   1* 7 (15.6%)
2 5   1 1* 7 (15.6%)
Positive 3 1 1    2 (4.4%)
Total 35 (77.8%) 6 (13.3%) 1 (2.2%) 3 (6.7%) 45 (100.0%)
  1. HER2, Human epidermal growth factor receptor 2; IHC, Immunohistochemistry
  2. *indicates HER2 gene amplification by silver in situ hybridization