Table 1.

Effect of postoperative adjuvant therapy on the expression of SOX2

Group(n)	Primary (%)					Recurrence (%)
	0+	1+	2+	3+	0+	1+	2+	3+	P a
No adjuvant therapy n = 8	1	0	1	6	1	1	2	4	0.317
Adjuvant therapy n = 15	1	1	0	14	5	3	5	3	0.003
Chemo-radiotherapy n = 12	1	1	0	10	5	2	3	2
Radiotherapy n = 3	0	0	0	3	0	1	1	1
Chemotherapy n = 1	0	0	0	1	0	0	1	0

^aWilcoxon rank sum test was used to analyze the change of SOX2 expression between paired primary and recurrent samples