CEACAM5 and cancer: In total, 17 clinical features—gender, age, grade/differentiation, tumor size, number of regional lymph node involvement, cancer stage, residual tumor on edge of primary site, radiation therapy, chemotherapy, BMI, smoking, alcohol drinking, Betel nut chewing, carcinoembryonic antigen CEA test value, carcinoembryonic antigen CEA difference value, Helicobacter pylori, and lymphatic or vascular invasion—are statistically significant variables.