Figure 1. Gene expression of AKR1C3 and AKR1D1 in training and validation sets. (A) The mRNA expression of AKR1C3 and AKR1D1 in the training set. (B) The volcano plot of differential expressed genes in the validation set. (C) The receiver operating characteristic (ROC) curve of AKR1C3 and AKR1D1. (D) Genetic alteration information of the AKR1 gene family.