PGK1 and breast lobular carcinoma: The discrepancy in the correlation between results of our study and those from the TCGA dataset may be that PGK1 expression was examined in this study at the protein level but not at the mRNA level shown in the TCGA dataset, and only ductal breast carcinoma was detected in the TCGA dataset, while besides ductal breast carcinoma, other breast cancer types such as lobular breast carcinoma were also examined in this study.