Cisplatin is a widely used anticancer drug, but its nephrotoxicity is a serious problem. To examine whether the novel biomarker, urinary vanin-1, could predict reduction in renal function after dosing of cisplatin. We conducted a prospective single-center pilot study of 24 patients with urothelial carcinoma who received cisplatin-based chemotherapy between 2012 and 2015. The primary outcome was a 20% or greater decline in estimated glomerular filtration rate (eGFR) from baseline within the first 6days of cisplatin. Urine concentration of creatinine, kidney injury molecule-1 (KIM-1), neutrophil gelatinase-associated lipocalin (NGAL) and NAG (N-acetyl-β-d-glucosaminidase) as well as vanin-1 were measured during the perioperative period. During 6days after cisplatin, 37.5% (9/24) of patients showed more than 20% decline in eGFR (baseline, 68.8±11.1mL/min/1.73m(2); on day 6, 51.0±2.5mL/min/1.73m(2)) and this reduction persisted until day 10. Urinary vanin-1, but not KIM-1, NGAL and NAG, significantly elevated early on day 3 after cisplatin, which preceded the elevation of serum creatinine on day 6. Sensitivity and specificity of a cutoff point of urinary vanin-1 (9.31ng/mg Cr) on day 3 were calculated to be 66.7% (95% CI: 0.30-0.93) and 83.3% (95% CI: 0.52-0.97), respectively, for predicting 20% decline in eGFR during 6days after cisplatin. These data suggest that urinary vanin-1 is an early predictive biomarker for decline in eGFR in patients with urothelial carcinoma after dosing of cisplatin.
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