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Proposed Histopathologic Grading System for MTC
| Mitotic Count/2 mm2 | Ki-67 Proliferative Index (%) | Coagulative Necrosis | Grade |
|---|---|---|---|
| <3 | <3 | Absent | Low |
| <3 | <3 | Present | Intermediate |
| 3-20 | 3-20 | Absent | Intermediate |
| 3-20 | 3-20 | Present | High |
| >20 | >20 | Present or absent | High |
