A previously healthy 64-year-old man comes to the physician because of intermittent fatigue, fever, and hematuria over the past month. Examination of the prostate shows no abnormalities. Laboratory studies show:
Serum calcium: 12 mg/dL
Serum phosphorus: 0.8 mg/dL
Serum urea nitrogen: 20 mg/dL
Serum creatinine: 1.2 mg/dL
Urine blood: 2+
Urine protein: Negative
Which of the following is the most likely diagnosis?
Adenocarcinoma
Goodpasture syndrome
Granulomatosis with polyangiitis
Lupus nephritis
Polyarteritis nodosa
Squamous cell carcinoma
