The immunohistochemical (IHC) profile showed positivity for cytokeratin (CK) and carcinoembryonic antigen (CEA), with negativity for markers typically associated with RCC (e.g., PAX8, CD10) and urothelial carcinoma (e.g., GATA3, uroplakin). Here, PAX8 is linked to urothelial carcinoma.