AFP and gastric cancer: Univariate analyses revealed that pT stage, pN stage, venous invasion (yes or no), nerve invasion (yes or no), Ki-67–positive rate (>50% yes or no), tumor size (>3cm yes or no), Lauren type (intestinal or diffuse-mixed), and serum AFP levels (positive vs. negative) were prognostic factors for GC (P < 0.05, Table 2).