How do the quantitative ER and PR Scores compare with measurements from my local pathology lab by IHC?
ER and PR by IHC measure protein expression by staining receptors on the cell surface. Quantitative ER and PR by RT-PCR measure the RNA expression of these genes. Several studies have demonstrated high concordance between ER and PR by IHC and quantitative ER and PR by RT-PCR. -+ ER and PR Scores constitute a precise, reproducible and alternate method to determine a patient’s ER and PR status.