Table 2.
Comparison of clinical characteristics between IMPC and IDC in case‐matched analysis
| IMPC (%) | IDC (%) | P value | |
|---|---|---|---|
| Age | 0.964 | ||
| <60 | 496 (50.4) | 497 (50.5) | |
| ≥60 | 488 (49.6) | 487 (49.5) | |
| Race | 0.161 | ||
| White | 750 (76.2) | 791 (80.4) | |
| Black | 130 (13.2) | 104 (10.6) | |
| Asian or Indian | 97 (9.9) | 83 (8.4) | |
| Unknown | 7 (0.7) | 6 (0.6) | |
| Marital status | 0.297 | ||
| Married | 546 (55.5) | 515 (52.3) | |
| Unmarried | 388 (39.4) | 422 (42.9) | |
| Unknown | 50 (5.1) | 47 (4.8) | |
| Histologic grade | 1.000 | ||
| Grade I | 72 (7.3) | 72 (7.3) | |
| Grade II | 516 (52.4) | 516 (52.4) | |
| Grade III | 363 (36.9) | 363 (36.9) | |
| Unknown | 33 (3.4) | 33 (3.4) | |
| AJCC stage | 1.000 | ||
| I | 372 (37.8) | 372 (37.8) | |
| II | 390 (39.6) | 390 (39.6) | |
| III | 222 (22.6) | 222 (22.6) | |
| T stage | 1.000 | ||
| T1 | 575 (58.4) | 575 (58.4) | |
| T2 | 308 (31.3) | 308 (31.3) | |
| T3 | 77 (7.8) | 77 (7.8) | |
| T4 | 24 (2.4) | 24 (2.4) | |
| N stage | 1.000 | ||
| N0 | 479 (48.7) | 479 (48.7) | |
| N1 | 310 (31.5) | 310 (31.5) | |
| N2 | 106 (10.8) | 106 (10.8) | |
| N3 | 89 (9.0) | 89 (9.0) | |
| ER | 1.000 | ||
| Negative | 118 (12.0) | 118 (12.0) | |
| Positive | 866 (88.0) | 866 (88.0) | |
| PR | 1.000 | ||
| Negative | 239 (24.3) | 239 (24.3) | |
| Positive | 745 (75.7) | 745 (75.7) | |
| Breast surgery | 1.000 | ||
| BCS | 532 (54.1) | 532 (54.1) | |
| Mastectomy | 452 (45.9) | 452 (45.9) | |
| Lymph nodes removed | 0.932 | ||
| None | 46 (4.7) | 41 (4.2) | |
| <10 | 574 (58.3) | 576 (58.5) | |
| ≥10 | 361 (36.7) | 363 (36.9) | |
| Unknown | 3 (0.3) | 4 (0.4) | |
| Radiation therapy | 0.891 | ||
| None or unknown | 429 (43.6) | 426 (43.3) | |
| Yes | 555 (56.4) | 558 (56.7) | |
| Chemotherapy | 0.684 | ||
| None or unknown | 454 (46.1) | 445 (45.2) | |
| Yes | 530 (53.9) | 539 (54.8) |