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Summary of Weiss score criteria.
| Criteria | Scoring points | |
|---|---|---|
| 0 | 1 | |
| Nuclear grade (Fuhrmann nuclear grade system) | I/II | III/IV |
| Mitoses | <6/10 HPF | ≥6/10 HPF |
| Atypical mitoses | − | + |
| Clear cell component | <25% | ≥25% |
| Diffuse architecture | <1/3 | ≥1/3 |
| Confluent necrosis | − | + |
| Venous invasion | − | + |
| Sinusoidal invasion | − | + |
| Capsular infiltration | − | + |
Adapted from references (111-113).
Abbreviation: HPF, high power fields.
