Table 1.
Characteristics of Screening Mammograms in Women With a Personal History of Breast Cancer (PHBC) and Matched Screening Mammograms in Women Without a PHBC
| No. (%) |
||||
|---|---|---|---|---|
| Women (n = 19 078) With PHBC |
Women (n = 55 315) Without PHBC |
|||
| Screening Mammogramsa |
Second Breast Cancers Within 1 Year of Screeningb |
Screening Mammogramsa |
Breast Cancers Within 1 Year of Screeningb |
|
| Screening examinations, total | 58 870 | 655 | 58 870 | 342 |
| Age at mammography, y | ||||
| <40 | 727 (1.2) | 14 (1.9) | 727 (1.2) | 0 |
| 40–49 | 6104 (10.4) | 98 (1.6) | 6104 (10.4) | 18 (0.3) |
| 50–59 | 14 532 (24.7) | 165 (1.1) | 14 532 (24.7) | 50 (0.3) |
| 60–69 | 14 795 (25.1) | 130 (0.9) | 14 795 (25.1) | 90 (0.6) |
| 70–79 | 15 171 (25.8) | 165 (1.1) | 15 171 (25.8) | 113 (0.7) |
| ≥80 | 7541 (12.8) | 83 (1.1) | 7541 (12.8) | 71 (0.9) |
| BI-RADS breast density | ||||
| 1, Almost entirely fatty | 3448 (7.5) | 18 (0.5) | 3448 (7.5) | 9 (0.3) |
| 2, Scattered fibroglandular tissue | 22 155 (48.3) | 224 (1.0) | 22 155 (48.3) | 117 (0.5) |
| 3, Heterogeneously dense | 17 885 (39.0) | 219 (1.2) | 17 885 (39.0) | 116 (0.6) |
| 4, Extremely dense | 2418 (5.3) | 39 (1.6) | 2418 (5.3) | 17 (0.7) |
| Missing data | 12 964 (22.0) | 155 (1.2) | 12 964 (22.0) | 83 (0.6) |
| Race/ethnicity | ||||
| White, non-Hispanic | 47 489 (84.2) | 531 (1.1) | 47 119 (83.3) | 285 (0.6) |
| Black, non-Hispanic | 2018 (3.6) | 21 (1.0) | 2027 (3.6) | 9 (0.4) |
| Hispanic | 4707 (8.3) | 45 (1.0) | 4783 (8.5) | 14 (0.3) |
| Asian/Pacific Islander | 984 (1.7) | 10 (1.0) | 1115 (2.0) | 12 (1.1) |
| Other | 1234 (2.2) | 13 (1.1) | 1496 (2.6) | 8 (0.5) |
| Missing data | 2438 (4.1) | 35 (1.4) | 2330 (4.0) | 14 (0.6) |
| Family history of breast cancer | ||||
| No | 37 956 (76.8) | 381 (1.0) | 41 065 (82.4) | 187 (0.5) |
| Yes | 11 459 (23.2) | 169 (1.5) | 8744 (17.6) | 81 (0.9) |
| Missing data | 9455 (16.1) | 105 (1.1) | 9061 (15.4) | 74 (0.8) |
| Menopausal status | ||||
| Pre | 3580 (6.9) | 74 (2.1) | 5945 (11.2) | 15 (0.3) |
| Peri | 763 (1.5) | 19 (2.5) | 722 (1.4) | 4 (0.6) |
| Post | 47 187 (91.6) | 483 (1.0) | 46 600 (87.5) | 313 (0.7) |
| Missing data | 7340 (12.5) | 79 (1.1) | 5603 (9.5) | 10 (0.2) |
| Time since last mammogram, mo | ||||
| No previous mammogram | 106 (0.2) | 4 (3.8) | 1581 (2.9) | 18 (1.1) |
| 9–14 | 47 872 (82.7) | 511 (1.1) | 23 799 (43.1) | 94 (0.4) |
| 15–23 | 7358 (12.7) | 84 (1.1) | 14 743 (26.7) | 95 (0.6) |
| ≥24 | 2579 (4.5) | 46 (1.8) | 15 122 (27.4) | 108 (0.7) |
| Missing data | 955 (1.6) | 10 (1.0) | 3625 (6.2) | 27 (0.7) |
| Time since first breast cancer diagnosis, yc | ||||
| <1 | 4416 (7.5) | 61 (1.4) | ||
| 1–2 | 14 139 (24.0) | 144 (1.0) | ||
| 3–4 | 14 085 (23.9) | 139 (1.0) | ||
| 5–6 | 10 664 (18.1) | 123 (1.2) | ||
| 7–9 | 9681 (16.4) | 116 (1.2) | ||
| ≥10 | 5885 (10.0) | 72 (1.2) | ||
| Stage of initial breast cancer diagnosisc | ||||
| Ductal carcinoma in situ | 12 140 (20.6) | 197 (1.6) | ||
| Invasive, stage I | 29 558 (50.2) | 281 (1.0) | ||
| Invasive, stage II | 17 172 (29.2) | 177 (1.0) | ||
| Primary surgeryc | ||||
| Breast conserving without radiation | 7503 (13.0) | 132 (1.8) | ||
| Breast conserving with radiation | 29 986 (51.9) | 335 (1.1) | ||
| Mastectomy | 20 232 (35.1) | 157 (0.8) | ||
| Missing data | 1149 (2.0) | 31 (2.7) | ||
| Radiation therapyc | ||||
| None | 20 872 (36.2) | 246 (1.2) | ||
| Any | 36 862 (63.8) | 380 (1.0) | ||
| Missing data | 1136 (1.9) | 29 (2.6) | ||
| Adjuvant systemic therapyc | ||||
| Neither | 28 003 (50.6) | 363 (1.3) | ||
| Chemotherapy | 7765 (14.0) | 91 (1.2) | ||
| Endocrine therapy | 14 127 (25.5) | 103 (0.7) | ||
| Both | 5472 (9.9) | 47 (0.9) | ||
| Missing data | 3503 (6.0) | 51 (1.5) | ||
| Self-reported history of breast implant, reduction, or reconstructiond | ||||
| No | 41385 (93.1) | 445 (1.1) | 48839 (99.2) | 259 (0.5) |
| Yes | 3088 (6.9) | 25 (0.8) | 380 (0.8) | 1 (0.3) |
| Missing data | 14397 (24.5) | 185 (1.3) | 9651 (16.4) | 82 (0.8) |
Abbreviations: BI-RADS, Breast Imaging Reporting and Data System; PHBC, personal history of breast cancer.
a
Percentages were computed after exclusion of missing values.
b
Percentages calculated based on row denominator.
c
Data on first breast cancer diagnosis for PHBC only.
d
Distribution for each variable (by laterality) available from the authors.