Table 1.
Patient Characteristics for Treatment Cohort [n = 54,592] (n, %)*
| Characteristic | White (n = 48,626) | Black (n = 3,623) | Hispanic (n = 2,343) | p-Value |
|---|---|---|---|---|
| Age | ||||
| 66–70 | 14,027 (29) | 1,253 (35) | 848 (36) | <.0001 |
| 71–75 | 14,145 (29) | 1,096 (30) | 735 (31) | |
| 76–80 | 11,747 (24) | 751 (21) | 464 (20) | |
| 81–85 | 6,404 (13) | 375 (10) | 222 (9) | |
| >85 | 2,303 (5) | 148 (4) | 74 (3) | |
| Socioeconomic status | ||||
| Median income | ||||
| Quartile 1 (lowest) | 8,646 (18) | 2,142 (59) | 931 (40) | <.0001 |
| Quartile 2 | 11,573 (24) | 806 (22) | 618 (26) | |
| Quartile 3 | 12,948 (27) | 409 (11) | 467 (20) | |
| Quartile 4 (highest) | 15,089 (31) | 246 (7) | 314 (13) | |
| High school (HS) diploma rates | ||||
| Quartile 1 (areas w/lowest HS graduation rates) | 8,219 (17) | 2,018 (56) | 1,225 (52) | <.0001 |
| Quartile 2 | 11,705 (24) | 887 (24) | 515 (22) | |
| Quartile 3 | 13,231 (27) | 471 (13) | 350 (15) | |
| Quartile 4 (highest HS graduation rates) | 15,101 (31) | 227 (6) | 240 (10) | |
| Unknown socioeconomic status (zip code) | 370 (0.8) | 20 (0.6) | 13 (0.6) | |
| Marital status | ||||
| Married | 23,342 (48) | 999 (28) | 964 (41) | <.0001 |
| Single | 23,772 (49) | 2,484 (69) | 1,322 (56) | |
| Unknown | 1,512 (3) | 140 (4) | 57 (2) | |
| Charlson comorbidity | ||||
| 0 | 43,213 (89) | 2,807 (77) | 1,979 (84) | <.0001 |
| 1 | 3,652 (8) | 486 (13) | 236 (10) | |
| ≥2 | 1,761 (4) | 330 (9) | 128 (5) | |
| Year of diagnosis | ||||
| 1992 | 1,623 (3) | 137 (4) | 80 (3) | <.0001 |
| 1993 | 1,618 (3) | 129 (4) | 46 (2) | |
| 1994 | 1,665 (3) | 121 (3) | 73 (3) | |
| 1995 | 1,746 (4) | 147 (4) | 69 (3) | |
| 1996 | 1,758 (4) | 122 (3) | 85 (4) | |
| 1997 | 1,878 (4) | 139 (4) | 82 (4) | |
| 1998 | 1,887 (4) | 141 (4) | 79 (3) | |
| 1999 | 2,001 (4) | 146 (4) | 93 (4) | |
| 2000 | 4,257 (9) | 313 (9) | 199 (8) | |
| 2001 | 4,439 (9) | 290 (8) | 182 (8) | |
| 2002 | 4,519 (9) | 304 (8) | 179 (8) | |
| 2003 | 4,358 (9) | 343 (9) | 223 (10) | |
| 2004 | 4,418 (9) | 347 (10) | 212 (9) | |
| 2005 | 4,139 (9) | 324 (9) | 269 (11) | |
| 2006 | 4,183 (9) | 303 (8) | 241 (10) | |
| 2007 | 4,137 (9) | 317 (9) | 231 (10) | |
| Tumor size | ||||
| ≤2 cm | 22,455 (46) | 1,323 (37) | 857 (37) | <.0001 |
| 2.1–3.0 cm | 5,013 (10) | 447 (12) | 273 (12) | |
| >3 cm | 3,934 (8) | 518 (14) | 245 (10) | |
| Unknown | 17,224 (35) | 1,335 (37) | 968 (41) | |
| Number of nodes positive | ||||
| 0 | 29,037 (60) | 1,857 (51) | 1,288 (55) | <.0001 |
| 1–3 | 8,255 (17) | 764 (21) | 474 (20) | |
| 4–9 | 2,972 (6) | 362 (10) | 209 (9) | |
| ≥ 10 | 1,578 (3) | 157 (4) | 95 (4) | |
| Unknown | 6,784 (14) | 483 (13) | 277 (12) | |
| Stage at diagnosis | ||||
| I | 28,382 (58) | 1,598 (44) | 1,130 (48) | <.0001 |
| II | 16,491 (34) | 1,549 (43) | 963 (41) | |
| III | 3,753 (8) | 476 (13) | 250 (11) | |
| Tumor grade | ||||
| Well differentiated | 10,931 (22) | 499 (14) | 462 (20) | <.0001 |
| Moderately differentiated | 19,899 (41) | 1,201 (33) | 893 (38) | |
| Poorly differentiated/undifferentiated | 13,146 (27) | 1,466 (40) | 756 (33) | |
| Unknown | 4,650 (10) | 457 (13) | 232 (10) | |
| Hormone receptor status | ||||
| Hormone receptor-positive | 23,004 (47) | 1,369 (38) | 899 (38) | <.0001 |
| Hormone receptor-negative | 3,864 (8) | 494 (14) | 208 (9) | |
| Unknown receptor status | 21,758 (45) | 1,760 (49) | 1,236 (53) | |
| Surgery received | ||||
| Mastectomy | 13,036 (27) | 1,426 (39) | 818 (35) | <.0001 |
| Breast conserving surgery | 35,590 (73) | 2,197 (61) | 1,525 (65) | |
| SEER registry | ||||
| Connecticut | 6,392 (13) | 200 (6) | 131 (6) | <.0001 |
| Detroit | 5,348 (11) | 1,028 (28) | 57 (2) | |
| New Mexico | 1,154 (2) | † | 264 (11) | |
| Seattle | 4,728 (10) | 58 (2) | 24 (1) | |
| Atlanta and rural Georgia | 1,966 (4) | 430 (12) | 28 (1) | |
| Kentucky | 2,835 (6) | † | † | |
| Louisiana | 2,227 (5) | 461 (13) | 20 (9) | |
| New Jersey | 6,401 (13) | 515 (14) | 211 (9) | |
| California | 17,575 (36) | 796 (22) | 1,599 (68) | |
| County | ||||
| Major metropolitan | 32,499 (67) | 2,887 (80) | 1,560 (67) | <.0001 |
| Metropolitan | 11,747 (24) | 570 (16) | 618 (26) | |
| Urban | 2,474 (5) | 81 (2) | 60 (3) | |
| Less urban | 1,623 (3) | † | † | |
| Rural | 283 (0.6) | † | † | |
*
Differences examined using chi-square testing. Percentages within categories may not sum to 100% due to rounding.
†
Cell sizes suppressed for reasons of confidentiality if at least one column and/or row had sample sizes <11.