Table 1.

Comparison of clinical characteristics between IMPC and IDC

	IMPC (%)	IDC (%)	P value
Age			0.050
<60	496 (50.4)	169 936 (53.5)
≥60	488 (49.6)	147 542 (46.5)
Race			0.010
White	750 (76.2)	254 378 (80.1)
Black	130 (13.2)	32 900 (10.4)
Asian or Indian	97 (9.9)	28 669 (9.0)
Unknown	7 (0.7)	1531 (0.5)
Marital status			0.035
Married	546 (55.5)	183 940 (57.9)
Unmarried	388 (39.4)	121 930 (38.4)
Unknown	50 (5.1)	11 608 (3.7)
Grade			0.000
Grade I	72 (7.3)	59 617 (18.8)
Grade II	516 (52.4)	126 152 (39.7)
Grade III	363 (36.9)	123 643 (39.0)
Unknown	33 (3.4)	8066 (2.5)
AJCC stage			0.000
I	372 (37.8)	163 128 (51.4)
II	390 (39.6)	115 677 (36.4)
III	222 (22.6)	38 673 (12.2)
T stage			0.000
T1	575 (58.4)	201 710 (63.5)
T2	308 (31.3)	95 109 (30.0)
T3	77 (7.8)	13 290 (4.2)
T4	24 (2.4)	7369 (2.3)
N stage			0.000
N0	479 (48.7)	212 494 (66.9)
N1	310 (31.5)	75 494 (23.8)
N2	106 (10.8)	19 945 (6.3)
N3	89 (9.0)	9545 (3.0)
ER			0.000
Negative	118 (12.0)	71 606 (22.6)
Positive	866 (88.0)	245 872 (77.4)
PR			0.000
Negative	239 (24.3)	104 319 (32.9)
Positive	745 (75.7)	213 159 (67.1)
Breast surgery			0.000
BCS	532 (54.1)	190 216 (59.9)
Reconstruction	135 (13.7)	29 091 (9.1)
CPM	94 (9.6)	25 822 (8.1)
Mastectomy	278 (28.3)	85 757 (27.0)
Lymph nodes removed			0.000
None	46 (4.7)	14 115 (4.4)
<10	574 (58.3)	205 762 (64.8)
≥10	361 (36.7)	96 284 (30.3)
Unknown	3 (0.3)	1317 (0.4)
Radiation therapy			0.399
None or unknown	429 (43.6)	142 667 (44.9)
Yes	555 (56.4)	174 811 (55.1)
Chemotherapy			0.000
None or unknown	454 (46.1)	172 763 (54.4)
Yes	530 (53.9)	144 715 (45.6)