ERBB2 and breast carcinoma: The MammaTyper® is an RT-qPCR-based, CE-marked molecular in vitro diagnostic assay used for categorizing tumor resection specimens and pre-operative core needle biopsies of breast carcinomas into five subtypes (luminal A-like, luminal B-like (HER2-positive), luminal B-like (HER2-negative), HER2-positive (non-luminal) and triple negative (ductal)) as defined by the 2013 St Gallen consensus [13].