A PR was defined as an at least 30% decrease in the sum of the longest diameters of the target lesions for more than 4 weeks without new area of malignant disease. PD indicated an at least 20% increase in the sum of the longest diameter of the target lesions or a new malignant lesion. Stable disease was defined as insufficient shrinkage to qualify for PR and insufficient increase to qualify for PD. An objective see more response rate (ORR) indicated the proportion of patients achieved CR and PR, while a disease control rate (DCR) indicated the proportion

of patients achieved CR, PR and SD. Progression-free Ivacaftor survival (PFS) was measured from Day 1 of treatment until the first objective or clinical sign of disease progression. Overall survival (OS) was measured from Day 1 of treatment until the date of death. The alteration of patients’

symptoms including appetite, fatigue, cough, dyspnea, hemoptysis and pain referencing to Lung Cancer Symptom Scale (LCSS) [16] was observed. Symptomatic remission was considered if the score over 25 points. Symptom remission time means the span from initial administration to symptom remission. Adverse effects including 5 degrees (0-IV) were evaluated following the standard enacted by the World Health Organization in 1981. Statistical considerations OICR-9429 The data was analyzed by SPSS11.5. Intergroup comparison was conducted by X2 checking. Survival analyses were performed by Kaplan-Meier method. Survival deviation was calculated by Log-Rank

test. All P-values were considered significant if P ≤ 0.05. Results Clinical efficacy All of these patients were eligible. None of the patients achieved CR. 15 patients (33.3%) achieved PR and 17 patients (37.8%) had stable disease (SD). 13 patients (28.9%) developed progressive disease (PD). ORR and DCR was 33.3% and 71.1% respectively. Subset analysis according to basic traits of the patients was shown in Table 1. Table 2 showed that the efficacy of gefitinib therapy correlated with gender, tumor histology (P < 0.05). However, other factors such as age, smoking status, disease stage, and ECOG-PS didn't correlate with the efficacy of gefitinib therapy. Table 2 Gradational analysis of ORR and DCR Characters ORR(%) P value DCR(%) P value Gender            Male Oxymatrine 13.3 0.033 52.6 0.019    Female 40.0   84.6   Age(year)            < 70 34.3 1.000 71.4 1.000    ≥70 30.0   70.0   Smoking status            Smokers 17.6 0.082 58.8 0.281    Nonsmokers 42.9   78.6   Tumor histology            Adeno. And BAC 43.3 0.044 83.3 0.027    Non-adeno.    13.3   46.7   Stage            IIIb 28.6 0.909 78.6 0.699    IV 35.5   67.7   PS value            ≤ 2 37.5 0.561 75.5 0.589    3~4 23.1   61.5   It is notable that there were 4 patients with brain metastasis in this trial, including 3 cases of PR and 1 case of SD. Brain metastatic focuses disappeared in 2 patients of PR, and their primary tumor reduced. One of them expressed headache palliative at the day 1.