Table 1 Patient characteristics

Median age (range)

62 (41 ~ 76)

62 (29 ~ 83)

62 (29 ~ 83)

0.963

Median interval between cancer diagnosis and brain metastases (range)

422.5 (0 ~ 2155)

905 (22 ~ 1668)

542 (0 ~ 2155)

0.779

Brain metastases at initial presentation [N (%)]

 Yes

2 (100)

0 (0)

2

0.125

 No

10 (32)

21 (68)

31

Intracranial surgery prior to radiation therapy [N (%)]

 No

7 (50)

7 (50)

14

0.273

 Yes

5 (26)

14 (74)

19

Primary site [n (%)]

 Colon

4 (24)

13 (76)

17

0.247

 Esophagus

3 (50)

3 (50)

6

 Other

4 (67)

2 (33)

6

 Rectum

1 (25)

3 (75)

4

BMs [n (%)]

 ≤2

4 (17)

19 (83)

23

0.001*

 >2

8 (80)

2 (20)

10

ECOG [N (%)]

 Unknown

0 (0)

1 (100)

1

0.273

 ≤1

8 (50)

8 (50)

16

 >1

4 (25)

12 (75)

16

RPA class [N (%)]

 Unknown

0 (0)

1 (100)

1

0.144

 I and II

8 (53)

7 (47)

15

 III

4 (24)

13 (76)

17