MUC1 and gastric cancer: Patients with MUC1 positive expression had a higher rate of tumors with background intestinal metaplasia (p = 0.015), diffuse type histology (p < 0.001; Figure 2A,B), advanced gastric cancer (tumors invading the proper muscle or deeper; Figure 2C) (p < 0.001), perineural invasion (p = 0.027; Figure 2D–F), lymphovascular invasion (p = 0.015; Figure 2A,B), lymph node metastasis (p = 0.001), and distant metastasis (p = 0.017) compared to those without MUC1 expression (Table 3).