Please Cite OSbrca:  Yan Z, Wang Q, Sun X, Ban B, Lu Z, Dang Y, Xie L, Zhang L, Li Y, Zhu W and Guo X (2019) OSbrca: A Web Server for Breast Cancer Prognostic Biomarker Investigation With Massive Data From Tens of Cohorts. Front. Oncol. 9:1349. doi: 10.3389/fonc.2019.01349

DFI and PFI were defined by Liu et al. [Liu, J., Lichtenberg, T., Hoadley, K. A. et al. (2018). An integrated TCGA pan-cancer clinical data resource to drive high-quality survival outcome analytics. Cell,173(2), 400-416.]