There was also a significant difference in the expression level of PR between CHBC and non-hereditary breast cancer patients (P < 0.05), not only with respect to the expression level of PR (++) (X2 = 6.42, P < 0.05), but also for the expression level of PR (+++) (X2 = 4.66, P < 0.05). Here, PGR is linked to breast cancer.