Table 1 General demographic and clinical data of patients

Age (mean ± SD (range))

59.79 ± 11.65 (34–84)

Cell free DNA concentration—MN Kit (mean ± SD (range)) (ng/ml)

13.92 ± 4.11 (3.6–22.3)

Cell free tumor DNA—QIAGEN Kit (mean ± SD (range)) (ng/ml)

19.1 ± 6.03 (6.1–32.6)

Recurrence after (month) (mean ± SD (range))

7.76 ± 5.4 (1–19)

Gender

 Male

45.5%

 Female

54.5%

Smoking

 Yes

22.7%

 No

77.3%

Stage

 II

2.3%

 III

4.5%

 IV

93.2%

Recurrence

 Yes

56.8%

 No

43.2%

Current status

 Alive

67.6%

 Dead

32.4%

Metastasis

 Non metastatic

11.4%

 Metastasis to one organ

68.1%

 Metastasis to two organ

9.1%

 Metastasis to three organ

11.4%