The median 24hUP at diagnosis was 2168 mg (interquartile range [IQR] 808–5795), with a median serum creatinine of 1.1 (IQR 0.9–1.5) mg/dL. Renal involvement at diagnosis was seen in 394 (69%) of included patients. At diagnosis, 54 out of 534 patients (10%) with a urine protei...