Table 1.
Main features of the included studies. Cases reviewed represent all thyroid histological cases reviewed retrospectively in the studies. Bethesda V and Bethesda VI column report the overall cases with FNA among all patients operated upon.
| Reference | Cases reviewed | NIFTP found | ROM considering NIFTP as a cancer (%) | ROM considering NIFTP as non-malignant (%) | Bethesda V | Bethesda VI |
|---|---|---|---|---|---|---|
| (13) | 655 | 85 | 52.8 | 39.8 | 94 | 156 |
| (14) | 1886 | 94 | 18.1 | 13.2 | 69 | 94 |
| (15) | 1826 | 173 | 48.0 | 38.5 | 238 | 587 |
| (16) | 312 | 16 | 32.6 | 27.5 | 29 | 39 |
| (17) | 2044 | 59 | 54.3 | 51.4 | 142 | 695 |
| (18) | 1891 | 25 | 91.2 | 89.9 | 393 | 1038 |
| (19) | 2226 | 139 | 45.0 | 38.8 | NA | NA |
| (20) | 353 | 26 | 28.0 | 20.6 | 33 | 99 |
| (21) | 2559 | 79 | 26.4 | 23.3 | 210 | 413 |
| Total | 13,752 | 696 | 45.7 | 40.6 | 1208 | 3121 |