| Tumor staging | |
| Grade I: 3–5 points | |
| Grade II: 6–7 points | |
| Grade III: 8–9 points | |
| Tubule formation: | |
| More than 75% of the tumor | 1 |
| From 10–75% of the tumor | 2 |
| Less than 10% of the tumor | 3 |
| Nuclear pleomorphism: | |
| Small and regular nuclei | 1 |
| Moderate increase in nuclear size | 2 |
| Marked pleomorphism or nucleolus | 3 |
| Mitotic index: | |
| 0–8 mitosis per 10 fields | 1 |
| 9–16 mitosis per 10 fields | 2 |
| More than 17 mitosis per field | 3 |
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