In K19-Wnt1/C2mE transgenic (GAN) mice, after injecting the GAN-KP cells into the gastric wall, the GAN-KP-E tumor tissue that formed in the mucosal lamina propria of the gastric epithelium exhibited the characteristics of epithelial-type cancer, while the GAN-KP-S tumor tissue that formed in the submucosa of the gastric epithelium showed the characteristics of mesenchymal-type cancer. This evidence concerns the gene WNT1 and neoplasm.