Table 2.

Changes in RNA Quality and Gene Expression Ratios Due to the Time Elapsed between Resection and Freezing of Tissue Samples.

Time from Resection (min)	RNA Quality 28S:18S	Mean Gene Expression Ratio (log2)	SD	Median Gene Expression Ratio (log2)
Time course 1 (number of genes = 623)
5	2.27	-0.01	0.42	-0.09
10	2.06	0.08	0.32	0.04
15	2.46	-0.16	0.76	-0.34
20	2.16	-0.08	0.38	-0.14
30	2.44	0.09	0.35	0.04
60	2.09	0.01	0.37	-0.06
120	2.05	-0.14	0.58	-0.28
Time course 2 (number of genes = 300)
10	1.94	-0.04	0.39	-0.05
20	2.00	-0.03	0.36	-0.06
30	1.91	-0.06	0.49	-0.05
40	2.11	0.01	0.33	0
50	2.03	-0.15	0.46	-0.16
60	2.56	-0.32	0.47	-0.41