Table 1.
Characteristics of patients primarily diagnosed with ductal carcinoma in situ (DCIS) in 2011–2015: MRI group and age-matched controls by age group
| All ages | < 50 years | 50–74 years | ||||
|---|---|---|---|---|---|---|
| MRI group | Age-matched controls | MRI group | Age-matched controls | MRI group | Age-matched controls | |
| (n = 1571) | (n = 1571) | (n = 379) | (n = 379) | (n = 1165) | (n = 1165) | |
| Primary DCIS grade, n (%) | ||||||
| Low | 119 (8%) | 267 (17%) | 26 (7%) | 81 (22%) | 90 (8%) | 180 (15%) |
| Intermediate | 505 (33%) | 544 (35%) | 129 (35%) | 131 (35%) | 364 (32%) | 401 (35%) |
| High | 927 (60%) | 732 (47%) | 218 (58%) | 161 (43%) | 698 (61%) | 562 (49%) |
| Unknown | n = 20 | n = 28 | n = 6 | n = 6 | n = 13 | n = 22 |
| Surgery*, n (%) | 1544 (98%) | 1520 (97%) | 374 (99%) | 363 (96%) | 1147 (98%) | 1134 (97%) |
| BCS | 801 (51%) | 1078 (69%) | 136 (36%) | 218 (58%) | 657 (56%) | 844 (72%) |
| Mastectomy | 743 (47%) | 441 (28%) | 238 (63%) | 145 (38%) | 490 (42%) | 289 (25%) |
| None | 27 (2%) | 52 (3%) | 5 (1%) | 16 (4%) | 18 (2%) | 32 (3%) |
| Radiotherapy, n (%) | 738 (47%) | 959 (61%) | 127 (34%) | 193 (51%) | 605 (52%) | 755 (65%) |
Percentages may not add up to 100% because of rounding
BCS breast-conserving surgery, IQR interquartile range
*Type of surgery missing for one patient aged 50–74 years