Table 1 Clinicopathologic parameters of patients.

From: PD-L1 expression in pleural effusions of pulmonary adenocarcinoma and survival prediction: a controlled study by pleural biopsy

Clinicopathologic parameter

N (total = 51)

Median age

67.06 ± 12.10

Sex

  Male

30

  Female

21

Smoking

  Never

39

  Ever

12

Stage IV

51

Distant metastasis

25

  Brain

15

  Bone

5

  Live

2

  More than two distant organs

3

EGFR mutation

20

Anticancer therapy

  No

8

  Intrapleural injection of cisplatin

8

  Systemic chemotherapy

15

  EGFR-TKIS

20