An association between renal cell carcinoma and multiple myeloma: a case series and clinical implications.

Objective: To describe an association between renal cell carcinoma (RCC) and multiple myeloma (MM) in patients with both disorders, and suggest possible explanations for the association.

Patients And Methods: We retrospectively reviewed the records of patients with MM and RCC at the Cleveland Clinic between 1990 and 2005, and identified 1100 with MM, 2704 with RCC and eight with concomitant MM and RCC. The medical records of these eight patients were reviewed.