Frequent amplifications of ESR1, ERBB2 and MDM4 in primary invasive lobular breast carcinoma. Basudan A, Cao L, Sikora MJ, Bahreini A, Tasdemir N, Levine KM, Jankowitz RC, McAuliffe PF, Dabbs D, Haupt S, Haupt Y, Lucas PC, Lee AV, Oesterreich S, Atkinson