Table 2.
Number of Cases With EGFR Mutation, Copy Number Positivity, or EGFR Protein Expression Positivity*
| EGFR Alteration | Positive | Negative | Assay Failure | Total |
|---|---|---|---|---|
| Mutation | 19 (48) | 21 | — | 40 |
| Copy number | ||||
| Chromogenic in situ hybridization | 16 (43) | 21 | 3 | 37 |
| Fluorescence in situ hybridization | 20 (54) | 17 | 3 | 37 |
| Immunohistochemical results | ||||
| Intensity | 14 (44) | 18 | 8 | 32 |
| Score | 10 (31) | 22 | 8 | 32 |
| ≥10% cutoff | 21 (66) | 11 | 8 | 32 |
EGFR, epidermal growth factor receptor.
*
Data are given as number (percentage) or number of cases.