ERBB2 and breast cancer: Specifically, results from the consensus clustering analysis indicated that the STAT1-/- mammary tumors and human luminal breast cancers clustered 62% of the time upon 1,000 re-samplings but that the MMTV-Neu and MMTV-PyMT clustered with human luminal breast cancers only 42% of the time upon 1,000 re-samplings.