Introduction of the MIND method allowed effective modelling of OR‐positive disease and enabled us to create a living biobank of 115 DCIS‐MIND models, which provides a deeper insight in DCIS biology, as well as a collection of 19 distributable DCIS models encompassing both luminal and HER2‐positive subtypes. This evidence concerns the gene ERBB2 and ductal breast carcinoma in situ.