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PD-L1 Expression and Intratumoral Heterogeneity Across Breast Cancer Subtypes and StagesDill, Erik A.; Gru, Alejandro A.; Atkins, Kristen A.; Friedman, Lisa A.; Moore, Margaret E.; Bullock, Timothy N.; Cross, Janet V.; Dillon, Patrick M.; Mills, Anne M. · The American Journal of Surgical Pathology · 2017