Table 3 Modified Ryan scheme for tumor regression scoring in rectal cancer treated preoperatively
S.No | Description | Regression score |
|---|---|---|
1 | No viable cancer cells | 0 (complete response) |
2 | Single cells or rare small groups of cancer cells | 1 (near-complete response) |
3 | Residual cancer with evident tumor regression | 2 (partial response) |
4 | Extensive residual cancer with no apparent tumor regression | 3 (no response) |