ERBB2 and breast cancer: When the miRNA levels detected in the ErbB2-positive breast cancers were averaged apart from the other breast cancers and compared to the 67 different miRNAs found expressed in the ErbB2-positive breast cancer cell line, SKBr3, a surprising concordance was observed (Spearman rank order correlation, Rs = +0.43, n = 67, p < 0.001), suggesting that this cell line model of ErbB2-positive breast cancer closely reflects the miRNA expression profile found in clinical samples of ErbB2-positive breast cancers (Supplement file 4).