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Article History

Received: 4 May 2017

Accepted: 9 January 2018

First Online: 30 January 2018

Ethics approval and consent to participate

: This study makes use of data generated by TCGA Research Network () and the Molecular Taxonomy of Breast Cancer International Consortium (Metabric). Funding for the Metabric project was provided by Cancer Research UK and the British Columbia Cancer Agency Branch.

: Not applicable.

: All authors are employees of Genentech and hold shares in Roche.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.