Table 4.

Correlation between duration of corticosteroid treatment and levels of insulin or growth hormone in cyst fluid and serum

		Pearson’s r =	p-value
Insulin	Cyst fluid (n = 25)	+ 0.48	0.015
	Serum (n = 15)	+ 0.11	0.7
Growth hormone	Cyst fluid (n = 25)	− 0.50	0.011
	Serum (n = 15)	− 0.07	0.8

Prior to neurosurgery, 25 patients with cystic glioblastoma received corticosteroid treatment for 0–30 days to reduce peri-tumoral edema. For 15 patients parallel serum samples were available for analysis. Data are Pearson’s correlation coefficients and corresponding p-values