Table 1. Patient characteristics.
| IMPC (%) | IDC (%) | P-value | |
|---|---|---|---|
|
Age at diagnosis |
Mean 61.3 years |
Mean 60.5 years |
0.11 |
| Ethnicitya |
|
|
0.053 |
| White | 494 (79.3) | 238 765 (82.2) | |
| Black | 69 (11.1) | 29 933 (10.3) | |
| Asian Pacific Islander | 59 (9.5) | 20 383 (7.0) | |
| American Indian | 1 (0.2) | 1392 (0.5) | |
| Unknown |
4 |
1579 |
|
| Oestrogen receptor |
|
|
<0.00001 |
| Positive | 501 (84.1) | 201 171 (75.1) | |
| Negative | 95 (15.9) | 66 535 (24.9) | |
| Unknown |
40 |
30 029 |
|
| Progesterone receptor |
|
|
<0.005 |
| Positive | 412 (70.2) | 16 8173 (63.9) | |
| Negative | 175 (29.8) | 95 134 (36.1) | |
| Unknown |
49 |
34 428 |
|
| Positive lymph nodes |
|
|
<0.00001 |
| None | 265 (48.0) | 168 696 (65.4) | |
| 1–3 | 169 (30.6) | 61 132 (23.7) | |
| 4 or more | 118 (21.4) | 28 294 (11.0) | |
| Unknown |
84 |
39 613 |
|
| Histological grade |
|
|
<0.000001 |
| 1 | 60 (10.0) | 51 591 (18.1) | |
| 2 | 294 (49.2) | 116 332 (40.9) | |
| 3 | 244 (40.8) | 116 541 (41.0) | |
| Unknown |
38 |
13 271 |
|
| Tumour location |
|
|
0.06 |
| Upper outer | 192 (35.4) | 102 176 (40.5) | |
| Upper inner | 77 (14.2) | 32 111 (12.7) | |
| Lower outer | 52 (9.6) | 20 036 (7.9) | |
| Lower inner | 41 (7.6) | 16 989 (6.7) | |
| Multiple | 148 (27.3) | 62 009 (24.6) | |
| Other | 32 (5.9) | 19 087 (7.6) | |
| Unknown |
94 |
45 327 |
|
| TNM classification |
|
|
<0.005 |
| T0 | 1 (0.2) | 118 (0.0) | |
| Tis | 0 (0.0) | 10 (0.0) | |
| T1 | 372 (62.2) | 175 346 (64.9) | |
| T2 | 165 (27.6) | 76 646 (28.4) | |
| T3 | 42 (7.0) | 10 480 (3.9) | |
| T4 | 18 (3.0) | 7635 (2.8) | |
| Unknown | 38 | 27 500 | |
| N0 | 315 (51.4) | 184 065 (65.9) | <0.00001 |
| N1 | 174 (28.4) | 65 152 (23.3) | |
| N2 | 59 (9.6) | 18 868 (6.8) | |
| N3 | 65 (10.6) | 11 303 (4.0) | |
| Unknown | 23 | 18 347 | |
| M0 | 611 (97.1) | 280 482 (96.1) | 0.19 |
| M1 | 18 (2.9) | 11 258 (3.9) | |
| Unknown |
7 |
5995 |
|
| Stage |
|
|
<0.00001 |
| I | 248 (40.3) | 138 668 (49.2) | |
| II | 242 (39.3) | 103 835 (36.8) | |
| III | 101 (16.4) | 27 458 (9.7) | |
| IV | 25 (4.1) | 11 983 (4.3) | |
| Unknown |
20 |
15 791 |
|
| Surgery type |
|
|
<0.05 |
| None | 34 (5.3) | 16 223 (5.5) | |
| Breast-conserving surgery | 312 (49.1) | 160 732 (54.2) | |
| Mastectomy | 290 (45.6) | 119 847 (40.4) | |
| Unknown |
0 |
933 |
|
| Radiation |
|
|
0.68 |
| No | 343 (53.9) | 158 119 (53.1) | |
| Yes | 293 (46.1) | 139 616 (46.9) |
Abbreviations: IDC=invasive ductal carcinoma; IMPC=invasive micropapillary carcinom; TNM, tumour nodes metastases.
a
Includes eight patients that had both IMPC and IDC.