Fig. 2
From: Intratumoral heterogeneity as a source of discordance in breast cancer biomarker classification
Representative images of cases with manually confirmed heterogeneous expression of ER, PR, and HER2 between any two cores from the same case. The percentage of ER- and PR-positive cells or HER2 status is indicated for each core. The starred cores illustrate examples of intracore heterogeneity. ER estrogen receptor, HER2 human epidermal growth receptor 2, PR progesterone receptor