Fig. 2

Data normalization and the distribution of differentially expressed genes (DEGs). (A) Box plots illustrating data normalization: the data distributions were neat after background adjustment and normalization. (B) Principal component analysis (PCA): each point in the PCA diagram represents a sample, and the distance between samples reflects the difference. After batch correction, individuals with similar genetic background were clustered together, and obvious stratification was observed between GC and adjacent normal gastric tissue samples. Gastric cancer, GC. normal controls, NCs