. 2016 Jun 1;5(8):2109–2116. doi: 10.1002/cam4.757

Table 1.

Patient and tumor characteristics of Luminal A invasive breast cancer cases

	N	Luminal A (HER2−)						P‐value^a
		ER+/PR+		ER+/PR−		ER−/PR+		ER+/PR+:	ER+/PR+:	ER+/PR−:
		N	%	N	%	N	%	ER+/PR−	ER−/PR+	ER−/PR+
Total	118,285	102,087		14,994		1204
Age at diagnosis								<0.0001	<0.0001	<0.0001
<50	21,777	19,299	18.9	2081	13.9	397	33.0
50–64	43,550	37,261	36.5	5849	39.0	440	36.5
65–74	28,705	24,836	24.3	3670	24.5	199	16.5
≥75	24,253	20,691	20.3	3394	22.6	168	14.0
Race/ethnicity								<0.0001	<0.0001	<0.0001
NH white	85,717	74,701	73.2	10,297	68.7	719	59.7
NH black	10,540	8371	8.2	1930	12.9	239	19.9
Asian/Pacific Islander	9117	7956	7.8	1094	7.3	67	5.6
Am.Indian/AlaskaNative	633	555	0.5	71	0.5	7	0.6
Hispanic	11,429	9766	9.6	1496	10.0	167	13.9
Unknown	849	738	0.7	106	0.7	5	0.4
AJCC stage								<0.0001	<0.0001	<0.0001
0–I	64,491	57,029	55.9	7018	46.8	444	36.9
II	34,905	29,601	29.0	4809	32.1	495	41.1
III	11,352	9329	9.1	1868	12.5	155	12.9
IV	4979	3997	3.9	900	6.0	82	6.8
Unknown	2558	2131	2.1	399	2.7	28	2.3
Tumor size								0.1503	<0.0001	<0.0001
≤0.5 cm	10,091	8724	8.5	1316	8.8	51	4.2
>0.5 cm	104,379	90,257	88.4	13,021	86.8	1101	91.4
Unknown	3815	3106	3.0	657	4.4	52	4.3
Poverty index								0.0833	<0.0001	<0.0001
Q1	28,333	24,551	24.0	3516	23.4	266	22.1
Q2	27,526	23,778	23.3	3513	23.4	235	19.5
Q3	28,566	24,569	24.1	3736	24.9	261	21.7
Q4	33,837	29,170	28.6	4226	28.2	441	36.6
Unknown	23	19	0.0	3	0.0	1	0.1

Summary of clinical and demographic characteristics of hormone receptor‐positive (HR+), HER2− Luminal A breast cancers in women with invasive breast cancer: Surveillance, Epidemiology and End Results 18, 2010–2012. NH, non‐Hispanic; ER, estrogen receptor; PR, progesterone receptor; HER2, human epidermal growth factor receptor 2.

P‐value calculations do not include unknown values.