Despite varying expression levels of WT1 antigen, 69% of cases with colorectal cancer could be detected using the same monoclonal antibody (6F-H2), with a particularly high ratio observed in well-to-moderately differentiated colorectal adenocarcinoma (76%) compared with poorly differentiated tumors (38%) [38]. The gene discussed is WT1; the disease is colorectal adenocarcinoma.