Keywords: Breast metastasis; CA, carbohydrate-associated antigen; CEA, carcinoembryonic antigen; CT, computerized tomography; Clear cell carcinoma; H&E, hematoxylin and eosin; Hematogenous metastasis; IHC, immunohistochemistry; MEN, multiple endocrine neoplasia; NET, neuroendocrine tumor; RCC, renal cell carcinoma; VHL, Von Hippel-Lindau.