Table 1.

A. Descriptive Statistics of U133A Patient Cohort

Characteristic	N	Caucasian	African American	p-value
#patients	63	52	11	-
Median age (yrs)	63	63.0	60.0	0.0582
Gleason Score	63			0.3065a
less than 7		24	3
equal to 7		18	7
greater than 7		10	1
Stage:	61			0.7264a
≤pT2 (n)		35	7
≥pT3 (n)		15	4
Surgical Margins	63			0.4799a
negative		35	9
positive		17	2
PSA	62	9.3	8.0	0.9120
Median tumor volume (cm3)	54	41.2	33.8	0.6640
B. Descriptive Statistics of the Tissue Percentages in U133A Array
Descriptive Stastistics of Total U133A Array
Characteristic	N	Caucasian	African American	p-value
#Array files	99	82	17
#Tumor Arrays	58	50	8
Median tumor %		43.5	41.5	0.4913
Median stroma %		45.5	47.0	0.7351
#Stroma Arrays	41	32	9
Median stroma %		77.0	70.0	0.5284
Descriptive Stastistics of Matched U133A Array
Characteristic	N	Caucasian	African American	p-value
#Array files	34	17	17
#Tumor-matched Arrays	16	8	8
tumor%: mean (st.dev) median		36 (21.4) 41.5	35.75 (21.3) 41.5	1.0000
stroma%: mean (st.dev) median		48.25 (18.4) 42.5	48.88 (17.8) 47.0	0.9162
#Stroma-matched Arrays	18	9	9
tumor%: mean (st.dev) median		0 (0) 0	0 (0) 0	n/a
stroma%: mean (st.dev) median		70.8 (15.2) 70.0	71.2 (15.7) 70.0	0.8246

(1A) Descriptive statistics of the clinical variables in the Affymetrix U133A gene chip data using Wilcoxon Mann Whitney and

^aFisher exact test were used to report significant differences between the two groups.

(1B) Descriptive statistics of the cell-type composition in the Affymetrix U133A gene chip data using Wilcoxon Mann Whitney were used to report significant differences between the two groups. There were no significant differences between all arrays or the matched subset.