%0 Journal Article %T Prognostic gene expression assays in breast cancer: are two better than one? %A Joseph A. Sparano %J Archive of "NPJ Breast Cancer". %D 2018 %R 10.1038/s41523-018-0063-9 %X Publisher's note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5964115/