This graph summarizes the impact of IAC on cancer incidence (14.0% vs. 47.3% p < 0.001) and multiplicity (0.18 vs. 0.85 cancers/rat, p < 0.0001), HIAC versus LIAC, respectively, as previously reported, as well as showing the mean percent progesterone receptor staining cells. Here, PGR is linked to cancer.