EGFR status

Objective response

Chi-2

Complete or partial response

Stable disease

Progressive disease

Not evaluable

P

Dako test*

negative (N = 131)

29 (22%)

35 (27%)

53 (40%)

14 (11%)

0.788

positive (N = 201)

48 (24%)

44 (22%)

85 (42%)

24 (12%)

All IHC tests

Full-negative cases (N = 86)

21 (24%)

24 (28%)

30 (35%)

11 (13%)

0.507

All other cases (N = 246)

56 (23%)

55 (22%)

108 (44%)

27 (11%)

Total (N = 332)

77

79

138

38