To select a breast cancer cell line to study the role of NDRG4 silencing, we performed an expression meta-analysis in 51 human breast cancer cell lines25 using the GOBO application.26 Approximately one-quarter of the cell lines expressed a high level of NDRG4; we did not observe significant associations between NDRG4 expression levels and clinical (data not shown) or histological subgroups (represented by different colors in Fig. 4a). The gene discussed is NDRG4; the disease is breast cancer.