Table 1 Demographic data of patients

Patients, no

36

20

31

Sex (men:women)

16:20

8:12

15:16

Age (years)

61.1 ± 12.2

54.4 ± 9.1

52.8 ± 7.5

Treated levels, no

Thoracic (14); lumbar (22)

Thoracic (8); lumbar (12)

Thoracic (18); lumbar (13)

Primary malignancy

 Breast cancer

11

7

12

 Lung cancer

7

4

7

 Prostate cancer

6

4

3

 Liver cancer

2

1

2

 Kidney cancer

2

2

1

 Thyroid cancer

1

0

1

 Colon cancer

1

0

1

 Stomach cancer

3

1

1

 Esophagus cancer

1

0

2

 Nasopharyngeal cancer

1

0

1

 Cervical cancer

1

1

0