Table 1.
Baseline characteristics of enrolled patients (n = 8,292), stratified by tumor size.
| Total | ≤4 cm | 4–7 cm | 7–10 cm | >10 cm | |
|---|---|---|---|---|---|
| N | 8,292 (100) | 1,212 (14.62) | 2,278 (27.47) | 2,482 (29.93) | 2,320 (27.98) |
| Age, year | |||||
| <40 | 352 (4.25) | 74 (6.11) | 86 (3.78) | 99 (3.99) | 93 (4.01) |
| 40–49 | 1,347 (16.24) | 216 (17.28) | 329 (14.44) | 363 (14.63) | 439 (18.92) |
| 50–59 | 2,520 (30.39) | 345 (28.47) | 634 (27.83) | 797 (32.11) | 744 (32.07) |
| 60–69 | 2,434 (29.35) | 330 (27.23) | 705 (30.95) | 697 (28.08) | 702 (30.26) |
| ≥70 | 1,639 (19.77) | 247 (20.38) | 524 (23.00) | 526 (21.19) | 342 (14.74) |
| Sex | |||||
| Male | 5,395 (65.06) | 718 (59.24) | 1,460 (64.09) | 1,653 (66.60) | 1,564 (67.41) |
| Female | 2,897 (34.94) | 494 (40.76) | 818 (35.91) | 829 (33.40) | 756 (32.59) |
| Race | |||||
| White | 7,081 (85.40) | 1,006 (83.00) | 1,962 (86.13) | 2,138 (86.14) | 1,975 (85.13) |
| Black | 541 (6.52) | 110 (9.08) | 129 (5.66) | 137 (5.52) | 165 (7.11) |
| Other | 623 (7.51) | 87 (7.18) | 176 (7.73) | 185 (7.45) | 175 (7.54) |
| Unknown | 47 (0.57) | 9 (0.74) | 11 (0.48) | 22 (0.89) | 5 (0.22) |
| Year of diagnosis | |||||
| 1988–1999 | 533 (6.43) | 99 (8.17) | 190 (8.34) | 145 (5.84) | 99 (4.27) |
| 2000–2015 | 7,759 (93.57) | 1,113 (91.83) | 2,088 (91.66) | 2,337 (94.16) | 2,221 (95.73) |
| Laterality | |||||
| Left | 4,746 (57.42) | 693 (57.18) | 1,344 (59.00) | 1,404 (56.57) | 1,305 (56.25) |
| Right | 3,546 (42.76) | 519 (42.82) | 934 (41.00) | 1,078 (43.43) | 1,015 (43.75) |
| Grade | |||||
| Grade I | 459 (5.54) | 165 (13.61) | 142 (6.23) | 101 (4.07) | 51 (2.20) |
| Grade II | 2,763 (33.32) | 596 (49.17) | 924 (40.56) | 714 (28.77) | 529 (22.80) |
| Grade III | 2,833 (34.17) | 235 (19.39) | 735 (32.27) | 919 (37.03) | 944 (40.69) |
| Grade IV | 1,223 (14.75) | 41 (3.38) | 189 (8.30) | 438 (17.65) | 555 (23.92) |
| Unknown | 1,014 (12.23) | 175 (14.44) | 288 (12.64) | 310 (12.49) | 241 (10.39) |
| T stage | |||||
| T1 | 2,498 (30.13) | 970 (80.03) | 1,289 (56.58) | 159 (6.41) | 80 (3.45) |
| T2 | 1,487 (17.93) | 53 (4.37) | 98 (4.30) | 819 (33.00) | 517 (22.28) |
| T3 | 3,861 (46.56) | 174 (14.36) | 831 (36.48) | 1,358 (54.71) | 1,498 (64.57) |
| T4 | 446 (5.38) | 15 (1.24) | 60 (2.63) | 146 (5.88) | 225 (9.70) |
| LNM | |||||
| No | 7,122 (85.89) | 1,171 (96.62) | 2,061 (90.47) | 2,070 (83.40) | 1,820 (78.45) |
| Yes | 1,170 (14.11) | 41 (3.38) | 217 (9.53) | 412 (16.60) | 500 (21.55) |
Data were n (%). LNM = lymph node metastases; Grade I = well differentiated; Grade II = moderately differentiated; Grade III = poorly differentiated; Grade IV = undifferentiated.