GPBAR1 and breast cancer: Turning now to the experimental evidence on survival analysis using the Kaplan–Meier plotter tool, it can be seen that the lower expression of the TGR5 gene is correlated with poor relapse-free survival (RFS) (Supplement Figure S5A) (p = 0.0016), but there are no significant differences in poor OS, postprogression survival (PPS), and distant metastasis-free survival in breast cancer.