Renal Cell Carcinoma Presenting as Carcinoma of Unknown Primary Site: Recognition of a Treatable Patient Subset

Patients with occult RCC can be identified in the CUP population using MCCA and/or IHC. Papillary carcinoma is more common in this group than in the larger RCC population. Although confirmation from prospective studies is needed, RCC-specific treatment should be considered for this group of patients.