A previously healthy 65-year-old man comes to the physician for a 2-month history of gross hematuria, fatigue, and fever. He has lost 5 pounds during this time. Laboratory studies show:
Hemoglobin 18.5 g/dL
Serum calcium 12.4 mg/dL
Serum phosphate 1.8 mg/dL
Which of the following is the most likely diagnosis?
Bronchogenic carcinoma
Clear cell carcinoma
Granulomatosis with polyangiitis
Multiple myeloma
Prostatic metastases
