ERBB2 and breast neoplasm: Comparison of the mRNA profiles to the gene expression classifiers described for breast tumours [54] consistently identified the normal breast samples as Class-Normal, MDAMB361 and HCC1419 as Luminal type A, and MCF7 as Luminal type B. BT20, PMC42, and HB4a clustered with the Basal and Her2 classifiers but their precise hierarchy varied depending on the algorithm employed (data not shown).