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The Dworak Tumor response grading system7
| Grade | Definition |
|---|---|
| Grade 0 | No response |
| Grade 1 | Minimal response (dominant tumor mass with obvious fibrosis, vasculopathy) |
| Grade 2 | Moderate response (dominant fibrotic changes with a few easy-to-find tumor cells or groups) |
| Grade 3 | Near complete response (few microscopically difficult-to-find tumor cells in fibrotic tissue with or without mucous substance) |
| Grade 4 | Complete response (no tumor cells, only fibrotic mass or acellular mucin pools) |
