Sachs et al. has shown that a biobank of more than 100 BC organoids not only represents all major BC subtypes [27], but also retains expression of the BC biomarkers ER, progesterone receptor (PR) and epidermal growth factor receptor 2 (EGFR2 or HER2) and preserves histopathological and genetic features. Here, ERBB2 is linked to breast cancer.