ERBB2 and breast carcinoma: By analyzing TCGA patient groups based on the median value of their tumor miR-155 expression levels, we also found a significant association between miR-155 expression levels and overall survival of luminal B patients, and similar trends were also observed in basal-like and HER2-type breast cancer patients, although the associations were not statistically significant due to the small sample size (Supplemental Figure 2C).