Table 2.
Summary of cancer characteristics. DBT = digital breast tomosynthesis, DM = digital mammography
| Detected DBT total | Detected DBT alone* | Detected DM total* | Detected DM alone | |
|---|---|---|---|---|
| Total | 67 | 21 | 47 | 1 |
| Total invasive cancers | 58 (87) | 17 (81) | 41 (87) | - |
| Total in situ cancers | 9 (13) | 4 (19) | 6 (13) | 1 (100) |
| Cancer type | ||||
| IDC | 37 (55) | 10 (48) | 27 (57) | - |
| DCIS + microfoci of IDC | 3 (4) | 1 (5) | 2 (4) | - |
| DCIS | 7 (10) | 3 (14) | 5 (11) | 1 (100) |
| ILC | 9 (13) | 3 (14) | 6 (13) | - |
| Tub | 9 (13) | 3 (14) | 6 (13) | - |
| LCIS | 2 (3) | 1 (5) | 1 (2) | - |
| Histological grade | ||||
| Grade 1 | 24 (36) | 10 (48) | 14 (30) | - |
| Grade 2 | 23 (34) | 5 (24) | 19 (40) | 1 (100) |
| Grade 3 | 18 (23) | 5 (24) | 13 (28) | - |
| n/a | 2 (3) | 1 (5) | 1 (2) | - |
| Lymph node status | ||||
| Positive | 14 (21) | 2 (10) | 12 (26) | - |
| Negative | 50 (74) | 18 (86) | 32 (68) | 1 (100) |
| n/a | 3 (4) | 1 (5) | 3 (6) | - |
| Mean size (range) | 16 mm (5–60) | 13 mm (6–25) | 17 mm (5–60) | 8 mm |
| Mean age (range) | 60 yrs (40–74) | 58 yrs (43–71) | 61 yrs (40–74) | 65 yrs |
| Breast density | ||||
| Fatty | 7 (10) | 3 (14) | 4 (9) | - |
| Scattered | 17 (25) | 5 (24) | 12 (26) | - |
| Heterogeneous | 33 (49) | 10 (48) | 24 (51) | 1 (100) |
| Dense | 10 (15) | 3 (14) | 7 (15) | - |
| Radiographic appearance | ||||
| Spiculated mass | 51 (76) | 16 (76) | 35 (74) | - |
| Circumscribed mass | 8 (12) | 3 (14) | 5 (11) | - |
| Architectural distortion | 1 (1) | 1 (5) | 0 (0) | - |
| Microcalcifications | 7 (10) | 1 (5) | 7 (15) | 1 (100) |
Data are n (%) or range when stated
IDC = invasive ductal carcinoma, DCIS = ductal carcinoma in situ, ILC = invasive lobular carcinoma, Tub = invasive tubular carcinoma,
LCIS = lobular carcinoma in situ
(*)There were no statistically significant differences between the characteristics of the cancers detected by DBT alone and DM total