KRT20 and cancer: Preoperative expression levels of CK20 in peripheral blood from patients with GCcorrelated with tumor diameter (P = 1.661 × 10−5), invasivedepth (P = 1.901 × 10−5), differentiation grade(P = .015), Borrmann type (P = 1.079 ×10−6), lymphatic metastasis (P = 1.968 × 10−14),tumor emboli in the microvessels (P = 1.338 × 10−7), andconcentration of cancer-related antigens in peripheral blood, including CEA(P = 3.683 × 10−8), CA724 (P = 5.234 ×10−8), and CA199 (P = 3.908 × 10−7).