The Frequency of Epidermal Growth Factor Receptor Mutation of Nonsmall Cell Lung Cancer according to the Underlying Pulmonary Diseases

Table 3

Characteristics of patients with an EGFR mutation treated with gefitinib.

Total number	43
Age (median, range)	67, 28–92
Gender
Male	13
Female	30
Smoking-status
Never	24
Ex/Current	19
Pack-years of smokers (median, range)	33, 2.5–225
Histology
Adenocarcinoma	42
Squamous cell carcinoma	1
Clinical stage of NSCLC
IB	2
IIIA	1
IIIB	7
IV	22
Recurrence	11
History of chemotherapy before gefitinib treatment
No	28
Yes	15
EGFR mutation
Ex18 G719C	1
Ex19 del	30
Ex21 L858R	10
Ex19 del + Ex21L858R	1
Ex19 del + Ex20 T790M	1
Chest CT
Normal	36
Emphysema	6
Fibrosis	1