Mice bearing NMuMG-ErbB2 tumours harbouring a LucA-shRNA had significantly more CTCs than mice with LPP-shRNA expressing NMuMG-ErbB2 tumours (average of 15.6±3.98 versus 3.59±1.59 colonies, respectively; Fig. 2a). This evidence concerns the gene ERBB2 and neoplasm.