Table 7. Grade Classifications by WHO/ISUP Grade (SSF1) and Traditional Grade/Differentiation Variable, 2010 (columns total to 100%).
| WHO/ISUP Grade (SSF1) | |||||
|---|---|---|---|---|---|
|
| |||||
| Grade/Differentiation | Low (code = 10) | High (code = 20) | Not Collected (code = 998) | Unknown (code = 999) | Total Casesa |
| Well Differentiated (Code = 1) | 1297 (21.5%) | 17 (0.2%) | 8 (3.2%) | 208 (7.3%) | 1530 |
| Intermediate (Code = 2) | 2348 (38.9%) | 185 (2.3%) | 15 (6.0%) | 530 (18.6%) | 3078 |
| Poorly Differentiated (Code = 3) | 68 (1.1%) | 2072 (26.1%) | 14 (5.6%) | 535 (18.8%) | 2689 |
| Undifferentiated (Code = 4) | 26 (0.4%) | 4285 (53.9%) | 12 (4.8%) | 358 (12.6%) | 4681 |
| Unknown (Code = 9) | 2298 (38.1%) | 1390 (17.5%) | 199 (80.2%) | 1214 (42.7%) | 5101 |
|
| |||||
| Total | 6037 (100%) | 7949 (100%) | 248 (100%) | 2845 (100%) | 17079 |
Abbreviations: ISUP, International Society of Urological Pathology; SSF, site-specific factor; WHO, World Health Organization.
a
Only cases with urothelial (transitional cell) morphology were included.