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Table 2 Results of EGFR immunostaining

From: Is EGFR expression altered following postoperative chemotherapy for colorectal adenocarcinoma?

Primary Distant Recurrence Total
  Negative 1+ 2+  
Negative 8 4 0 12
1+ 6 5 1 12
2+ 2 1 6 9
Total 16 10 7 33
  1. Negative No staining above the background
  2. 1+ Immunopositivity in < 50% of cells
  3. 2+ Immunopositivity in > 50% of cells