Table 1.
Clinical and demographic characteristics of the cohort stratified by radiation.
| Conformal radiation | IMRT | ||||
|---|---|---|---|---|---|
|
|
|||||
| N | (%) | N | (%) | P-value | |
| 3227 | (90.8) | 328 | (9.2) | ||
| Age (years) | 0.13 | ||||
| 65-69 | 733 | (90.2) | 80 | (9.8) | |
| 70-74 | 870 | (91.3) | 83 | (8.7) | |
| 75-79 | 796 | (92.3) | 66 | (7.7) | |
| ≥80 | 828 | (89.3) | 99 | (10.7) | |
| Race | 0.46 | ||||
| White | 2810 | (91.0) | 278 | (9.0) | |
| Black | 248 | (88.9) | 31 | (11.1) | |
| Other/Hispanic/missing | 169 | (89.9) | 19 | (10.1) | |
| Year of diagnosis | <0.0001 | ||||
| 2001/2002 | 1036 | (97.6) | 25 | (2.4) | |
| 2003 | 505 | (95.1) | 26 | (4.9) | |
| 2004 | 460 | (91.5) | 43 | (8.6) | |
| 2005 | 440 | (91.9) | 39 | (8.1) | |
| 2006 | 422 | (83.2) | 85 | (16.8) | |
| 2007 | 364 | (76.8) | 110 | (23.2) | |
| Marital status | 0.62 | ||||
| Married | 1385 | (90.4) | 147 | (9.6) | |
| Unmarried | 1744 | (91.2) | 199 | (8.8) | |
| Unknown | 98 | (89.1) | 12 | (10.9) | |
| Area of residence | 0.35 | ||||
| Metropolitan | 2931 | (90.6) | 303 | (9.4) | |
| Non-metropolitan | 296 | (92.2) | 25 | (7.8) | |
| SEER registry | <0.0001 | ||||
| Eastern | 1087 | (94.7) | 61 | (5.3) | |
| Midwest | 1110 | (90.7) | 114 | (9.3) | |
| West | 1030 | (87.1) | 153 | (12.9) | |
| Socioeconomic status | 0.12 | ||||
| Lowest (first) quintile/unknown | 390 | (88.4) | 51 | (11.6) | |
| Second quintile | 623 | (89.0) | 77 | (11.0) | |
| Third quintile | 762 | (91.5) | 71 | (8.5) | |
| Fourth quintile | 731 | (92.0) | 64 | (8.1) | |
| Highest (fifth) quintile | 721 | (91.7) | 65 | (8.3) | |
| Comorbidity score | 0.68 | ||||
| 0 | 1577 | (91.0) | 156 | (9.0) | |
| 1 | 913 | (91.0) | 90 | (9.0) | |
| ≥2 | 737 | (90.0) | 82 | (10.0) | |
| Tumor histology | 0.65 | ||||
| Endometrioid | 2207 | (90.5) | 233 | (9.6) | |
| Serous/clear cell | 340 | (90.9) | 34 | (9.1) | |
| Carcinosarcoma/leiomyosarcoma | 303 | (91.0) | 30 | (9.0) | |
| Other/unknown | 377 | (92.4) | 31 | (7.6) | |
| Stage1 | <0.0001 | ||||
| IA/IB | 250 | (88.0) | 34 | (12.0) | |
| IC | 396 | (89.8) | 45 | (10.2) | |
| INOS | 815 | (95.0) | 43 | (5.0) | |
| II | 491 | (92.0) | 43 | (8.1) | |
| III | 695 | (87.4) | 100 | (12.6) | |
| IV | 339 | (94.2) | 21 | (5.8) | |
| Unknown | 241 | (85.2) | 42 | (14.8) | |
| Tumor grade | 0.47 | ||||
| 1 | 526 | (90.5) | 55 | (9.5) | |
| 2 | 1004 | (91.9) | 89 | (8.1) | |
| 3 | 1255 | (90.4) | 133 | (9.6) | |
| Unknown | 442 | (89.7) | 51 | (10.3) | |
| Hysterectomy | 0.25 | ||||
| No | 474 | (89.4) | 56 | (10.6) | |
| Yes | 2753 | (91.0) | 272 | (9.0) | |
| Lymphadenectomy | 0.31 | ||||
| No | 1223 | (91.4) | 115 | (8.6) | |
| Yes | 2004 | (90.4) | 213 | (9.6) | |
| Brachytherapy | 0.006 | ||||
| No | 1593 | (89.4) | 188 | (10.6) | |
| Yes | 1634 | (92.1) | 140 | (7.9) | |
| Chemotherapy | <0.0001 | ||||
| No | 2306 | (92.5) | 187 | (7.5) | |
| Yes | 921 | (86.7) | 141 | (13.3) | |
| Location of radiation administration | <0.0001 | ||||
| Hospital-based | 52 | (100) | - | - | |
| Free standing | 883 | (87.4) | 127 | (12.6) | |
| Combination | 2292 | (91.9) | 201 | (8.1) | |
1
FIGO (International Federation of Obstetrics and Gynecology) 1998 staging criteria.
SEER=Surveillance, Epidemiology, and End Results. IMRT=intensity-modulated radiation therapy.