Table 2.
EGFR mutational subtypes
| Mutation subtype | N | Proportion (%) |
|---|---|---|
| EGFR 19del | 464 | 42.5 |
| EGFR exon21 L858R | 401 | 36.8 |
| EGFR exon20 T790M | 57 | 5.2 |
| EGFR exon20ins | 34 | 3.1 |
| EGFR exon21 L861Q | 32 | 2.9 |
| EGFR exon20 S768I | 25 | 2.3 |
| EGFR exon18 G719A | 24 | 2.2 |
| EGFR exon18 G719S | 10 | 0.9 |
| EGFR exon18 G719C | 7 | 0.6 |
| EGFR exon18 E709K | 5 | 0.5 |
| EGFR exon18 E709A | 4 | 0.4 |
| EGFR exon21 A871G | 4 | 0.4 |
| EGFR exon19 K754E | 3 | 0.3 |
| EGFR exon18 T725M | 2 | 0.2 |
| EGFR exon20 R776H | 1 | 0.1 |
| EGFR exon21 E865G | 1 | 0.1 |
| EGFR exon18 G724S | 1 | 0.1 |
| EGFR exon21 A871E | 1 | 0.1 |
| EGFR exon18 709_710del | 1 | 0.1 |
| EGFR exon18 T710I | 1 | 0.1 |
| EGFR exon18 K714N | 1 | 0.1 |
| EGFR exon20 R776S | 1 | 0.1 |
| EGFR exon21 K860I | 1 | 0.1 |
| EGFR exon18 E709G | 1 | 0.1 |
| EGFR exon19 E746fs | 1 | 0.1 |
| EGFR exon18 L718V | 1 | 0.1 |
| EGFR exon18 I706T | 1 | 0.1 |
| EGFR exon21 E866Q | 1 | 0.1 |
| EGFR exon20 R776C | 1 | 0.1 |
| EGFR exon20 R776G | 1 | 0.1 |
| EGFR exon19 E734K | 1 | 0.1 |
| EGFR exon19 A755D | 1 | 0.1 |
| EGFR exon19 D761Y | 1 | 0.1 |
| Total | 1091 | 100.0 |