Classifying the estrogen receptor status of breast cancers by expression profiles reveals a poor prognosis subpopulation exhibiting high expression of the ERBB2 receptor. - Kun Y; How LC; Hoon TP; Bajic VB; Lam TS; Aggarwal A; Sze HG; Bok WS; Yin WC; Tan P (Human molecular genetics, 2003)