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| EGFR | Exon 19(%) | Exon 21(%) | Total | ||
| Mut (−) | Mut (+) | Mut (−) | Mut (+) | ||
| Mut(−) | 402 (60.54) | 0 | 402 (60.54) | 0 | 402 (60.54) |
| Mut(+) | 141 (21.23) | 121 (18.22) | 121 (18.22) | 141 (21.23) | 262 (39.46) |
| Total | 543 (81.78) | 121 (18.22) | 523 (78.77) | 141 (21.23) | 664 (100) |
