Activation of Mitogen-Activated Protein Kinase in Estrogen Receptor α–Positive Breast Cancer Cells <i>In vitro</i> Induces an <i>In vivo</i> Molecular Phenotype of Estrogen Receptor α–Negative Human Breast TumorsChad J. Creighton, Dorraya El‐Ashry, Arul M. Chinnaiyan et al.|Cancer Research|2006Cited by 258