ERBB2 and neoplasm: When examining how Aurora-A protein and AURKA mRNA expression was distributed across molecular subtypes, we observed the highest levels of Aurora-A IHC positive tumor cells and AURKA mRNA expression in the triple negative and basal-like subtype in both the in-house and METABRIC cohorts (< 50 cohorts, n = 368), and high AURKA levels also in the luminal B and HER2 positive/enriched subtypes (Fig. 2A–C; Table 1).