Primary Ewing sarcoma/peripheral primitive neuroectodermal tumors in the cranial bone and mobile spine: what is the difference?

Table 2 Summary of clinical outcomes of primary Ewing sarcoma/peripheral primitive neuroectodermal tumors in the cranial bone

Parameters	Number	Progression-free survival		Overall survival
		Median time (month)	p value	Median time (month)	p value
Resection mode
GTR/ without GTR	7/6	15 vs. 5	0.019	30 vs. 13	0.021
Ki-67 index
≤ 30 / > 30%	5/8	8 vs. 7	0.972	19 vs. 18	0.916
Postoperative radiotherapy
Yes / no	7/6	15 vs. 5	0.008	29 vs. 6	0.008
Postoperative chemotherapy
Yes / no	7/6	8 vs. 7	0.584	25 vs. 18	0.948
GTR + radiotherapy
Yes / no	5/8	29 vs. 6	0.004	30 vs. 13	0.006
GTR + chemotherapy
Yes/no	4/9	15 vs. 7	0.053	19 vs. 14	0.145

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