ERBB2 and neoplasm: No significant relationship was found between clinicopathologic variables (sex, age, tumor differentiation, stage, or TNM classification) and EGFR overexpression, EGFR high polysomy/amplification, HER2 overexpression, HER2 amplification, TOP2A overexpression, TOP2A amplification, chromosome 7 polysomy, or chromosome 17 polysomy.