Overall numbers and percentages of EGFR positivity according to histological type in cases from included studies
| Histological type | EGFR positive | p value |
|---|---|---|
| EGFR, epidermal growth factor receptor; Ad, adenocarcinoma; Sq, squamous cell carcinoma; La, large cell carcinoma; Mis, miscellaneous. | ||
| *χ2 test. | ||
| †Three studies were excluded because they lacked information about EGFR positivity according to histological type. | ||
| Ad | 460/1175 (39.1%) | <0.0001* |
| Sq | 695/1206 (57.6%) | |
| La | 37/98 (37.8%) | |
| Mis | 41/130 (31.5%) | |
| Total | 1233/2609 (45.8%)† | |