| EGFR Gene Copies Number |  | ||
---|---|---|---|---|
 | Disomy [N (%)] | Polysomy [N (%)] | Amplification [N (%)] | p value |
Subsites | ||||
 Local (n = 31) | 22 (71.0) | 4 (80.0) | 5 (100.0) | 0.643 |
 Regional (n = 3) | 2 (6.5) | 1 (20.0) | 0 (0.0) |  |
 Distant metastasis (n = 7) | 7 (22.5) | 0 (0.0) | 0 (0.0) |  |
Tumor status | ||||
 T nulla (n = 10) | 9 (29.0) | 1 (20.0) | 0 (0.0) | 0.644 |
 Earlyb (n = 30) | 21 (67.7) | 4 (80.0) | 5 (100.0) |  |
 Advancedc (n = 1) | 1 (3.2) | 0 (0.0) | 0 (0.0) |  |
Lymph node metastasis | ||||
 Yes (n = 12) | 10 (32.3) | 2 (40.0) | 0 (0.0) | 0.289 |
 No (n = 29) | 21 (67.7) | 3 (60.0) | 5 (100.0) |  |
Radiation therapy | ||||
 Yes (n = 29) | 22 (71.0) | 4 (80.0) | 3 (60.0) | 0.936 |
 No (n = 12) | 9 (29.0) | 1 (20.0) | 2 (40.0) |  |
Chemotherapy | ||||
 Yes (n = 7) | 7 (22.6) | 0 (0.0) | 0 (0.0) | 0.256 |
 No (n = 34) | 24 (77.4) | 5 (100.0) | 5 (100.0) |  |