Dworak et al 22 | |
GR 0 | No regression |
GR 1 | Dominant tumour mass with obvious fibrosis and/or vasculopathy |
GR 2 | Dominant fibrotic changes with few tumour cells or groups (easy to find) |
GR 3 | Very few (difficult to find microscopically) tumour cells in fibrotic tissue with or without mucous substance |
GR 4 | No tumour cells, only fibrotic mass |
Rectal Cancer Regression Grading (RCRG) system | |
RCRG 1 | Sterilisation or only microscopic foci of adenocarcinoma remaining, with marked fibrosis |
RCRG 2 | Marked fibrosis but macroscopic disease present |
RCRG 3 | Little or no fibrosis, with abundant macroscopic disease |
RCPath dataset for colorectal cancer | |
RCPath A | No residual tumour cells and/or mucus lakes only |
RCPath B | Minimal residual tumour, that is, only occasional microscopic foci are identified with difficulty |
RCPath C | No marked regression |
GR, grading of regression; RCPath, Royal College of Pathologists.