Table 1.

Characteristics of CBCS participants with genotypmg data

Characteristic	Cases				Controls
	African American		Caucasian		African American		Caucasian
	N	%	N	%	N	%	N	%
N	742	100	1204	100	658	100	1089	100
Median age in years (range)	51 (23–74)		50 (24–74)		50 (26–74)		51 (21–74)
Proportion of European ancestry Mean (range)	0.222 (0.054–0.962)		0.936 (0.110–1)		0.226 (0.045–1)		0.934 (0.083–1)
Age (years)
<50	355	47.8	592	49.2	314	47.7	491	45.1
>=50	387	52.2	612	50.8	344	52.3	598	54.9
Menopausal status
Premenopausal	324	43.7	540	44.9	290	44.1	456	41.9
Postmenopausal	418	56.3	664	55.2	368	55.9	633	58.1
Stage
CISa	88	11.9	349	29.0
1	216	29.1	393	32.6
2	299	40.3	328	27.2
3	76	10.2	68	5.7
4	27	3.6	15	1.3
Missingb	36	4.9	51	4.2
Tumor Marker Status
ER+	322	43.4	672	55.8
ER−	341	46.0	344	28.6
Missing	79	10.6	188	15.6
ER−/PR−/HER2−	203	27.4	145	12.0

^aCIS carcinoma in situ

^bInvasive breast cancer cases