Our subsequent analysis showed that, after grouping according to tumor T status, N status, M status, ER status, PR status, HER-2 status, clinical stage, PAM50 status, histological type of breast cancer, and menopause status, compared with the control group, the expression level of COL11A1 in breast cancer tissues of each group was significantly increased (Figures 2A–H, Supplementary Figure S2). Here, PGR is linked to breast cancer.