[Retracted] Detection and Significance of Cell-Free DNA Mutation in Pleural Effusion in Patients with Advanced NSCLC

Table 2

Relationship between the EGFR gene status and clinicopathological characteristics of patients.

Item	EGFR mutation (n = 22)	EGFR wild (n = 28)	t/χ^2/
Age, years ()	59.55 ± 3.02	61.00 ± 4.21	1.362/0.178
Gender			3.342/0.068
Male	11 (50.00)	21 (75.00)
Female	11 (50.00)	7 (25.00)
Smoking history			7.782/0.005
Yes	7 (31.82)	20 (71.43)
No	15 (68.18)	8 (28.57)
Pathological type			5.009/0.025
Adenocarcinoma	19 (86.36)	16 (57.14)
Nonadenocarcinoma	3 (13.64)	12 (42.86)
Tumor stage			0.216/0.642
Stage IIIB	8 (36.36)	12 (42.86)
Stage IV	14 (63.64)	16 (57.14)
Lymph node metastasis			3.848/0.049
Yes	14 (63.64)	10 (35.71)
No	8 (36.36)	18 (64.29)