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| Grade | Level of regression | Degree description |
| Level 0 | Complete response | No residual cancer cells |
| Level 1 | Near complete response | Single cells/small groups of cancer cells remaining |
| Level 2 | Partial response | Significant tumor regression with residual cancer cells more than single cells or groups of cells |
| Level 3 | Poor or no response | Extensive residual cancer cells with no significant tumor regression |
