ERBB2 and gastric carcinoma: We aimed to evaluate human epidermal growth factor receptor 2 (ERBB2) protein expression and ERBB2 amplification in UTUCs according to the American Society of Clinical Oncology/College of American Pathologists guidelines for gastric carcinoma, revealing an obvious higher rate of ERBB2 overexpression (41.8%) in contrast to the relatively low frequency of ERBB2 amplification (10.5%) in UTUCs.