The aim of this study was to ascertain the level of concordance among gastrointestinal
pathologists for regression grading in rectal cancers treated with neoadjuvant
chemoradiation. Seventeen gastrointestinal pathologists participated using the Mandard,
Dworak, and modified rectal cancer regression grading systems to grade 10 representative
slides that were selected from 10 cases of rectal cancer treated with long-course
neoadjuvant chemoradiation. The slides were scanned with a whole-slide scanner …