In order to ascertain the interdependence between HER2 and PLAUR mRNA status in HER2-positive breast carcinoma, we constructed a correlation curve utilizing the HER2 and PLAUR mRNA values obtained from fresh frozen tissue of the former “Stiftung Tumorbank Basel” biobank (now part of the Biobank Pathology at the University Hospital of Basel, BPUB). Here, ERBB2 is linked to breast carcinoma.