ERBB2 and clear cell renal carcinoma: We checked other tissues sharing the morphologic aspect of ballooning of altered cells, i.e., mucoid degenerated cardiomyocytes after sublethal ischemia, clear cell renal cell carcinoma, and human papilloma virus–associated cell swelling of squamous cells of the skin, esophagus, and cervix uteri for ErbB2 expression with consistently negative findings.