The single-factor chi-square test showed that the following factors were associated with gastrointestinal hemorrhage: tumor size (P < 0.001), tumor location (P < 0.001), tumor T stage (P < 0.001), tumor M stage (P = 0.006), whether R0 resection was performed (P < 0.001), and positive expression of CD34 (P = 0.036). This evidence concerns the gene CD34 and neoplasm.