Contribution of tumour and immune cells to PD‐L1 expression as a predictive biomarker in metastatic triple‐negative breast cancer: exploratory analysis from KEYNOTE‐119 by Javier Cortes, Eric P Winer, Oleg Lipatov, Seock‐Ah Im, Anthony Gonçalves, Eva Muñoz‐Couselo, Keun Seok Lee, Peter Schmid, Kenji Tamura, Laura Testa, Isabell Witzel, Shoichiro Ohtani, Stephanie Hund, Karina Kulangara, Vassiliki Karantza, Jaime A Mejia, Junshui Ma, Petar Jelinic, Lingkang Huang, Scott K Pruitt, Kenneth Emancipator

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