XBP1 and breast cancer: These were: AR (oncogene; prostate cancer), CERS6, FOXA1 (oncogene; breast and prostate cancer), GPR160, KIAA1244, KLK5, SPDEF (DRG; breast, prostate, lung, and colon cancer), and XBP1 (oncogene; blood, esophageal, and brain cancer), all of which have been shown to be BC-related and differentially expressed between subtypes [92–96].