| EGFR gene copies number |  | |||
---|---|---|---|---|---|
EGFR gene copies | Disomy [n (%)] | Polysomy [n(%)] | Amplification [n (%)] | Discordance | P value |
Recurrent tumor | |||||
 Disomy (n = 31) | 24 (77.4) | 4 (12.9) | 3 (9.7) | 14/41 (34.1%) | 0.261 |
 Polysomy (n = 5) | 5 (100.0) | 0 (0.0) | 0 (0.0) |  | 0.510* |
 Amplificaiton (n = 5) | 2 (40.0) | 2 (40.0) | 1 (20.0) |  |  |
Second primary tumor | |||||
 Disomy (n = 12) | 11 (91.7) | 1 (8.3) | 0 (0.0) | 5/17 (29.4%) | 0.264 |
 Polysomy (n = 3) | 2 (66.7) | 1 (33.3) | 0 (0.0) |  | *NA |
 Amplificaiton (n = 2) | 1 (50.0) | 1 (50.0) | 0 (0.0) |  |  |
Lymph node metastasis | |||||
 Disomy (n = 34) | 25 (73.5) | 2 (5.9) | 7 (20.6) | 18/57 (31.6%) | <0.001 |
 Polysomy (n = 9) | 3 (33.3) | 4 (44.4) | 2 (22.2) |  | *0.389 |
 Amplificaiton (n = 14) | 4 (28.6) | 0 (0.0) | 10 (71.4) |  |  |