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Mandard’s system for reporting tumor regression grade
| TRG | Histopathological description |
|---|---|
| TRG 1 | No viable cancer cells, complete response |
| TRG 2 | Single cells or small groups of cancer cells |
| TRG 3 | Residual cancer outgrown by fibrosis |
| TRG 4 | Significant fibrosis outgrown by cancer |
| TRG 5 | No fibrosis with extensive residual cancer |
TRG: Tumor regression grade
