ERBB2 and breast cancer: Four representative phenolics (i.e., tyrosol, hydroxytyrosol, oleuropein aglycone and oleuropein glycoside) isolated from extra virgin olive oil (EVOO) -the juice of the olive obtained solely by pressing- were characterized for their abilities to affect breast cancer cell growth and survival, HER2 oncogene expression and activity and efficacy of HER2 oncogene-targeting therapies.