The ZCEA affibodies (ZCEA539, ZCEA546, and ZCEA919) stained tissue sections from human gastric cancer tissue [showed in brown color (upper layer)], which was similar to the staining pattern observed in polyclonal anti-CEA serum; nevertheless, human gastric cancer tissue stained with ZWT and PBS did not exhibit any obvious signal (Figure 4). This evidence concerns the gene CEACAM5 and gastric cancer.