Table 2.

SFRP4 protein expression in different astrocytoma grades.

IRS value		SFRP4
		Grade 2	Grade 3	Grade 4
IRS 0–4	N	4/10	6/10	26/30
	%	40	60	86.7
IRS 6–8	N	4/10	3/10	4/30
	%	40	30	13.3
IRS 9–12	N	2/10	1/10	0/30
	%	20	10	0
In total	N	10	10	30
	%	100	100	100

N, number of samples; %, percentage of samples.