Table 3 Summary of clinical outcomes of primary Ewing sarcoma/peripheral primitive neuroectodermal tumors in the mobile spine

Resection mode

 GTR/ without GTR

12/8

15 vs. 5

0.020

37 vs. 13

0.004

Ki-67 index

 ≤ 30 / > 30%

9/11

15 vs. 13

0.256

36 vs. 24

0.131

Postoperative radiotherapy

 Yes / no

12/8

25 vs. 9

0.005

36 vs. 13

0.002

Postoperative chemotherapy

 Yes / no

11/9

17 vs. 13

0.528

32 vs. 25

0.652

GTR + radiotherapy

 Yes / no

10/10

45 vs. 8

0.003

61 vs. 13

 < 0.001

GTR + chemotherapy

 Yes/no

7/13

15 vs. 14

0.272

37 vs. 25

0.159