Transcriptional analysis by qPCR on CD44+ or CD44− isolated from the gastric tumors of 30-week-old transgenic mice (K19-Wnt1/C2mE or Gan), confirmed that the relative mRNA abundance of H2O2 scavenging enzymes such as glutathione peroxidase (Gpx1 and Gpx2) and peroxiredoxin isoforms (Prdx1 and Prdx4) was significantly higher in CD44+ than in CD44− tumor cells. The gene discussed is CD44; the disease is neoplasm.