Table 1.

The population demographics and clinicopathological characteristics at baseline of cohort.

Variables	IDC (N = 230213)		Special breast cancer (N = 12650)		P value
	No	Percent (%)	No	Percent (%)
Age	60.99		64.24		<0.0001
Race					<0.0001
White	181539	79.3	9772	77.7
Black	25498	11.1	1597	12.7
Other	21970	9.6	1212	9.6
Grade					<0.0001
Grade1	49583	21.5	5820	46.0
Grade2	97036	42.2	3912	30.9
Grade3	82997	36.1	2844	22.5
Grade4	597	0.3	74	0.6
T stage					<0.0001
T0	66	<0.01	5	<0.01
T1	146043	63.4	8111	64.2
T2	65065	28.3	3496	27.6
T3	10796	4.7	711	5.6
T4	8243	3.6	327	2.5
N stage					<0.0001
N0	163359	71.0	10787	85.3
N1mi	6070	2.6	172	1.4
N1	43131	18.7	1174	9.3
N2	10982	4.8	298	2.4
N3	6671	2.9	219	1.7
M stage					<0.0001
M0	221060	96.0	12406	98.1
M1	9153	4.0	244	1.9
pTNM					<0.0001
I	126639	55.0	7657	60.5
II	72481	31.5	3983	31.5
III	21961	9.5	766	6.1
IV	9132	4.0	244	1.9
Subtype					<0.0001
LuminalA	162693	70.7	9578	75.7
LuminalB	26501	11.5	685	5.4
HER2	11735	5.1	338	2.7
TN	29284	12.7	2049	16.2
Surgery					<0.0001
Yes	217567	94.5	12200	96.4
No	12646	5.5	450	3.6
Radiotherapy					<0.0001
Yes	116589	50.6	6085	48.1
No/Unknown	113624	49.4	6565	51.9
Chemotherapy					<0.0001
Yes	96005	41.7	3408	26.9
No/Unknown	134208	58.3	9242	73.1