Hyperuricemia and hypoalbuminemia predispose to cisplatin-induced nephrotoxicity

The usefulness of pretreatment biochemical parameters in the prediction of nephrotoxicity associated with cisplatin treatment was studied. Twenty-two patients, who received 29 cycles of cisplatin, were evaluated. Cisplatin was given every 3-4 weeks with saline and mannitol. Azotemia occurred in almost all patients and was transient, peaking 1-2 weeks after therapy. The change in serum creatinine from baseline to peak correlated inversely with pretreatment serum albumin (r=-0.73; P<0.01) and with pretreatment uric acid (r=0.76; P<0.01). Ten patients with uric acid level of <6 mg/dl were receiving allopurinol. The competition between organic anions and cisplatin for excretion may, in part, explain the protective effects of hypouricemia. Hypoalbuminemia affects peritubular oncotic pressure and may in turn affect platinum excretion. Hypoalbuminemia also reduces the half-life of cisplatin, exposing the kidney to more of the unbound filterable drug.