Table 1 Clinicopathological characteristics of the 19 patients in the training data set

Case number

5

14

Age (mean ± SD)

68.4 ± 10.7

61 ± 9.6

0.111

 Male

3

14

0.012

 Female

2

0

 Upper/middle thoracic

1

7

0.244

 Lower thoracic

4

7

 Histological grade

 Well/moderate

4

13

0.421

 Poorly

1

1

 T1-2

3

3

0.111

 T3-4

2

11

 N0

2

3

0.418

 N1-3

3

11

 M0

5

14

–

 M1

0

0

 1–2

3

4

0.211

 3–4

2

10

 Negative

2

3

0.418

 Positive

3

11

 Negative

3

4

0.211

 Positive

2

10

 R0

5

14

–

 R1

0

0

 Preoperative chemotherapy

0

2

–

 Preoperative chemo radiation therapy (CRT)

0

1

 Postoperative chemotherapy

0

2

–

 Postoperative CRT

1

5

 Observation period (month, mean ± SD)

138.7 ± 45.1

14 ± 9.2

<0.001

 Duration between surgery and tumor relapse

–

10 ± 8.4

–

 Liver (H)

0

5

 Lymph node (Ly)

0

2

 Local (L)

0

1

 H + Ly

0

4

 Ly + L

0

2