| Grade | Description |
|---|---|
| Grade I | More than 75% of cancer cells are well-differentiated, classified as highly differentiated cancer, low malignancy |
| Grade II | 25% to 75% of cancer cells are well-differentiated, classified as moderately differentiated cancer, moderate malignancy |
| Grade III | Less than 25% of cancer cells are well-differentiated, classified as poorly differentiated cancer, high malignancy |
| Grade IV | Undifferentiated cancer |
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