Fig. 2

The oxidant and antioxidant level of the primary gastrointestinal cancer patients without anti-tumor treatments and healthy people. A The level of T-AOC of plasma in primary gastrointestinal cancer patients diagnosed for the first time and healthy people. B The GSH-Px activity of plasma in primary gastrointestinal cancer patients diagnosed for the first time and healthy people. C The content of MDA of plasma in primary gastrointestinal cancer patients diagnosed for the first time and healthy people. D The PBMCs ROS level were detected by flow cytometric analysis. E The level of PBMCs ROS in primary gastrointestinal cancer patients diagnosed for the first time and healthy people. F Ontology terms and KEGG pathways of the up-regulated genes between four cancer types and their paired normal tissues. G Heatmaps illustrating the average expression of these pathways-related genes in tumors and paired normal tissues. Values in the graphs represent the mean ± standard deviation; the symbol (***) indicates a significant increase compared with the control group (P < 0.001)