Table 4. Malignancy Rate According to BI-RADS Category.
| Year | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | Total | P |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BI-RADS 3 | ||||||||||||||
| DCIS | 1 (0.3) | 0 (0) | 1 (0.4) | 2 (0.8) | 1 (0.3) | 1 (0.3) | 1 (0.3) | 2 (0.6) | 0 (0) | 2 (0.7) | 2 (0.8) | 0 (0) | 13 (0.4) | 0.280 |
| Invasive cancer | 0 (0) | 3 (1.0) | 2 (0.7) | 1 (0.4) | 3 (0.9) | 3 (0.8) | 4 (1.0) | 3 (0.9) | 2 (0.6) | 1 (0.3) | 1 (0.4) | 1 (0.6) | 24 (0.7) | 0.446 |
| Total malignancy | 1 (0.3) | 3 (1.0) | 3 (1.1) | 3 (1.3) | 4 (1.2) | 4 (1.1) | 5 (1.3) | 5 (1.4) | 2 (0.6) | 3 (1.0) | 3 (1.1) | 1 (0.6) | 37 (1.0) | 0.324 |
| BI-RADS 4a | ||||||||||||||
| DCIS | 16 (2.6) | 13 (1.8) | 8 (1.1) | 10 (1.0) | 13 (1.1) | 21 (1.7) | 12 (1.1) | 24 (2.0) | 28 (2.3) | 40 (3.1) | 35 (2.4) | 37 (3.0) | 257 (2.0) | < 0.001 |
| Invasive cancer | 34 (5.6) | 31 (4.3) | 32 (4.5) | 43 (4.3) | 46 (3.8) | 63 (5.0) | 58 (5.3) | 77 (6.3) | 59 (4.8) | 63 (5.0) | 74 (5.0) | 42 (3.4) | 622 (4.8) | 0.446 |
| Total malignancy | 50 (8.2) | 44 (6.1) | 40 (5.6) | 53 (5.3) | 59 (4.9) | 84 (6.7) | 70 (6.4) | 101 (8.2) | 87 (7.0) | 103 (8.1) | 109 (7.4) | 79 (6.5) | 879 (6.7) | 0.020 |
| BI-RADS 4b | ||||||||||||||
| DCIS | 3 (7.1) | 1 (1.3) | 5 (5.6) | 6 (6.0) | 8 (6.8) | 12 (9.7) | 8 (11.1) | 6 (7.6) | 5 (6.0) | 12 (10.3) | 17 (12.1) | 19 (11.9) | 102 (8.5) | 0.001 |
| Invasive cancer | 10 (23.8) | 24 (30.8) | 33 (36.7) | 30 (30.0) | 37 (31.6) | 37 (29.8) | 27 (37.5) | 32 (40.5) | 36 (42.9) | 39 (33.6) | 53 (37.6) | 59 (36.9) | 417 (34.7) | 0.024 |
| Total malignancy | 13 (31.0) | 25 (32.1) | 38 (42.2) | 36 (36.0) | 45 (38.5) | 49 (39.5) | 35 (48.6) | 38 (48.1) | 41 (48.8) | 51 (44.0) | 70 (49.7) | 78 (48.8) | 519 (43.1) | < 0.001 |
| BI-RADS 4c | ||||||||||||||
| DCIS | 4 (3.5) | 15 (11.5) | 12 (11.8) | 11 (11.8) | 8 (7.8) | 14 (10.8) | 14 (12.0) | 12 (12.1) | 11 (11.3) | 22 (16.7) | 24 (13.2) | 22 (9.9) | 169 (11.1) | 0.046 |
| Invasive cancer | 76 (67.3) | 82 (63.1) | 71 (69.6) | 59 (63.4) | 78 (76.5) | 93 (71.5) | 78 (66.7) | 63 (63.6) | 67 (69.1) | 81 (61.4) | 132 (72.5) | 164 (73.5) | 1044 (68.7) | 0.193 |
| Total malignancy | 76 (67.3) | 82 (63.1) | 71 (69.6) | 59 (63.4) | 78 (76.5) | 93 (71.5) | 78 (66.7) | 63 (63.6) | 67 (69.1) | 81 (61.4) | 132 (72.5) | 164 (73.5) | 1044 (68.7) | 0.193 |
| BI-RADS 5 | ||||||||||||||
| DCIS | 11 (6.2) | 15 (6.2) | 7 (3.9) | 18 (9.2) | 19 (9.6) | 14 (7.0) | 22 (9.7) | 18 (7.2) | 25 (11.1) | 18 (6.5) | 23 (8.5) | 20 (6.9) | 210 (7.7) | 0.156 |
| Invasive cancer | 161 (89.9) | 226 (92.6) | 167 (93.3) | 164 (83.7) | 175 (87.9) | 183 (91.0) | 194 (85.5) | 228 (91.2) | 191 (84.5) | 253 (91.0) | 243 (89.7) | 262 (90.7) | 2447 (89.3) | 0.361 |
| Total malignancy | 172 (96.1) | 241 (98.8) | 174 (97.2) | 182 (92.9) | 194 (97.5) | 197 (98.0) | 216 (95.6) | 246 (98.4) | 216 (95.6) | 271 (97.5) | 266 (98.2) | 282 (97.6) | 2657 (97.0) | 0.175 |
Values are presented as numbers of malignant results with percentages in parenthesis. There was one case of breast cancer being assigned BI-RADS category 1 or 2 during 12-year study period.