Table 1.
Patient characteristics by treatment group
| All patients (n = 489)* | Lump + WBI (n = 108)* | Lump + Brachy (n = 103)* | Lump alone (n = 78)* | Mast alone (n = 89)* | Mast + RT (n = 111)* | P value | |
|---|---|---|---|---|---|---|---|
| Age at diagnosis | |||||||
| Median (range), y | 72 (67, 87) | 73 | 72 | 73 | 72 | 72 | |
| 67–74 y, n (%) | 335 (54.5) | 75 (59.1) | 72 (58.6) | 53 (31.4) | 63 (47.7) | 72 (59.2) | |
| ≥75 y, n (%) | 154 (45.5) | 33 (40.9) | 31 (41.4) | 25 (68.6) | 26 (52.3) | 39 (40.8) | .09 |
| Patient-reported race, n (%) | |||||||
| White | 420 (86.4) | 94 (86.7) | 90 (87.3) | 66 (86.3) | 74 (85.7) | 96 (86.7) | |
| Nonwhite | 69 (13.6) | 14 (13.3) | 13 (12.7) | 12 (13.7) | 15 (14.3) | 15 (13.3) | >.99 |
| Charlson Comorbidity Index, n (%) | |||||||
| 0 | 329 (67.6) | 76 (69.8) | 73 (67.4) | 48 (52.2) | 63 (67) | 69 (61.7) | |
| ≥1 | 160 (32.4) | 32 (30.2) | 30 (32.6) | 30 (47.8) | 26 (33) | 42 (38.3) | .75 |
| Patient-reported baseline BMI, n (%) | |||||||
| Underweight or normal weight | 157 (38.1) | 37 (38.9) | 32 (33.0) | 24 (48.3) | 35 (39.3) | 29 (28.0) | |
| Overweight | 143 (24.9) | 23 (22.1) | 34 (33.3) | 20 (22.4) | 23 (22.9) | 43 (46.0) | |
| Obese | 157 (36.9) | 40 (39) | 34 (33.7) | 29 (29.4) | 27 (37.8) | 27 (26.0) | .30 |
| Unknown | 32 | ||||||
| Patient-reported current bra cup size, n (%) | |||||||
| A or B | 152 (30.5) | 32 (29.3) | 32 (33.4) | 25 (50.1) | 29 (29.7) | 34 (29.3) | |
| C | 131 (26.8) | 35 (32.8) | 30 (27.4) | 23 (21.6) | 19 (19.2) | 24 (20.8) | |
| D or larger | 120 (24.4) | >20 (25.7) | >20 (29.5) | ≥20† | 18 (23.1) | 21 (18.2) | |
| Unknown | 86 (18.3) | ≤11† | ≤11† | <11† | 23 (28.0) | 32 (31.7) | .014 |
| Axillary surgery, n (%) | |||||||
| Axillary dissection or axillary surgery NOS | 248 (47.6) | 42 (38.7) | 31 (27.8) | 21 (21.7) | 56 (60.7) | ≥90† | |
| Sentinel lymph node biopsy | 164 (36.8) | 47 (44) | 52 (53.4) | 27 (51.3) | ≥23† | 11 (11.3) | |
| No axillary surgery | 77 (15.6) | 19 (17.3) | 20 (18.8) | 30 (27) | <11† | <11† | <.001 |
| Patient-reported endocrine therapy, n (%) | |||||||
| No | 193 (46.8) | 41 (41.4) | 40 (38.0) | 14 (14.9) | 53 (62.1) | 45 (41.0) | |
| Yes | 296 (53.2) | 67 (58.6) | 63 (62.0) | 64 (85.1) | 36 (37.9) | 66 (59.0) | <.001 |
| Chemotherapy, n (%) | |||||||
| No | 348 (79.2) | 90 (82.9) | ≥92† | ≥68† | 68 (80.2) | 26 (26.7) | |
| Yes | 141 (20.8) | 18 (17.1) | ≤11† | <11† | 21 (19.8) | 85 (73.3) | <.001 |
| Region, n (%) | |||||||
| Northeast | 83 (19.5) | 24 (23.9) | 16 (16.0) | 10 (12.5) | ≥12† | >15† | |
| Midwest | 120 (25.2) | 22 (19.2) | 24 (21.2) | 22 (43.0) | 26 (34.0) | 26 (24.2) | |
| South | 212 (40.8) | 41 (38.3) | 48 (49.3) | 30 (29.7) | 41 (42.6) | 52 (45.5) | |
| West | 72 (14.4) | 21 (18.6) | 15 (13.5) | 15 (14.2) | <11† | <15† | .03 |
| Patient-reported education, n (%) | |||||||
| High school or less | 182 (42.8) | 40 (39.6) | 29 (29.1) | 26 (28.6) | 40 (51.7) | 47 (45.5) | |
| Associate degree | 157 (33.3) | 38 (37.7) | 34 (37.1) | 25 (46.9) | 25 (24.9) | 35 (31.1) | |
| College or higher | 131 (24) | 23 (22.7) | 35 (33.8) | 24 (24.6) | 23 (23.4) | 26 (23.5) | .12 |
| Unknown | 19 | ||||||
| Patient-reported current household income, n (%) | |||||||
| <$40,000 | 213 (48.2) | 49 (45.4) | 30 (29.5) | 41 (67.5) | 43 (55.5) | 50 (46.9) | |
| $40,000–$60,000 | 74 (12.1) | 14 (11.9) | 19 (17.6) | 12 (9.7) | 13 (10.8) | 16 (14.0) | |
| >$60,000 | 115 (22.3) | 25 (22.6) | 30 (29.6) | 12 (9.7) | 20 (20.9) | 28 (24.4) | |
| Unknown | 87 (17.4) | 20 (20.1) | 24 (23.3) | 13 (13.0) | 13 (12.7) | 17 (14.8) | .19 |
| Has smoked 100 cigarettes in lifetime, n (%) | |||||||
| No | 284 (59.8) | 57 (57.3) | 50 (54.1) | 47 (66.5) | 60 (62.8) | 70 (66.4) | |
| Yes | 185 (40.2) | 44 (42.7) | 47 (45.9) | 28 (33.5) | 29 (37.2) | 37 (33.6) | .74 |
| Unknown | 20 | ||||||
Abbreviations: BMI = body mass index; Lump alone = lumpectomy plus endocrine therapy alone; Lump + Brachy = lumpectomy plus brachytherapy; Lump + WBI = lumpectomy plus whole-breast irradiation; Mast alone = mastectomy alone; Mast + RT = mastectomy plus radiation therapy; NOS = not otherwise specified.
*
All percentages are weighted percentages.
†
Cells were suppressed to avoid compromising patient identity based on claims data in accordance with our Data Use Agreement with the Centers for Medicare & Medicaid Services.