EGFR mutations | TTF-1 positive (n = 79) n (%) | TTF-1 negative (n = 5) n (%) | Total (n = 84) n (%) | P value |
---|---|---|---|---|
Exon 18 G719X | 8 (10.1) | 1 (20.0) | 9 (10.7) | 0.441 |
Exon 19 deletion | 43 (54.4) | 1 (20.0) | 44 (52.4) | 0.187 |
Exon 21 L858R | 30 (38.0) | 3 (60.0) | 33 (39.3) | 0.377 |
de novo T790 M | 1 (1.3) | 0 (0) | 1 (1.2) a | 1.000 |
Acquired T790 M | 15/27 (55.6) | 0 (0) | 15/27 (55.6) | NA |