**Figure 3.** (**A**) PCA plot among 3 datasets before eliminating “batch effects”. PCA, principal component analysis. (**B**) PCA plot among 3 datasets after eliminating “batch effects”. (**C**) Generated QQ plot and density plot after eliminating “batch effects”. (**D**) Validation of box plot of GSE26049 after eliminating “batch effects”, results illustrated that the median of each sample expression was on a straight line, indicating that the operation of removing “batch effects” did not affect the expression of each dataset.