Clinical and Pathological Features and Survival Outcomes of Breast Cancers with Intermediate ER Expression

The level of expression of ER defines groups of patients with varying characteristics and prognoses. Patients in the intermediate ER expression group had notable differences from patients in the high ER expression group including younger age, (more often) a higher grade, and low PR positivity. Differences observed between the group of patients with intermediate ER expression and that with high ER expression may help to prioritize therapeutic algorithms.