Heterogenous high-level HER-2 amplification in a small subset of colorectal cancers. - Marx AH; Burandt EC; Choschzick M; Simon R; Yekebas E; Kaifi JT; Mirlacher M; Atanackovic D; Bokemeyer C; Fiedler W; Terracciano L; Sauter G; et al. (Human pathology, 2010)