ERBB2 and breast cancer: Furthermore, we found that MEIOB was aberrantly expressed in breast cancer tumor tissues based on TCGA data set analyses (Figure 1B), and the ratio of expression was the highest in TNBCs when compared with other subtypes of breast cancer (expression ratio: TNBC, 11.3%; luminal, 4.5%; HER2+, 1.7%; normal-like, 0%; Figure 1C).