Pharmacokinetics and Safety of Olaparib in Patients with Advanced Solid Tumours and Renal Impairment

BackgroundOlaparib, a potent oral poly(ADP-ribose) polymerase inhibitor, is partially renally cleared. We investigated the pharmacokinetics and safety of olaparib in patients with mild or moderate renal impairment to provide dosing recommendations.MethodsThis phase I open-label study assessed the pharmacokinetics, safety and tolerability of single-dose, oral 300-mg olaparib tablets in adults (aged 18-75years) with solid tumours. Patients had normal renal function, or mild or moderate renal impairment (estimated creatinine clearance >= 81, 51-80 or 31-50mL/min, respectively). Blood was collected for 96h, and urine samples collected for 24h post-dose. Patients could continue taking olaparib 300mg twice daily for a long-term safety assessment.ResultsOverall, 44 patients received one or more doses of olaparib and 38 were included in the pharmacokinetic assessment. Patients with mild renal impairment had an area under the curve geometric least-squares mean ratio of 1.24 (90% confidence interval 1.06-1.47) and a geometric least-squares mean maximum plasma concentration ratio of 1.15 (90% confidence interval 1.04-1.27) vs. those with normal renal function. In patients with moderate renal impairment, the geometric least-squares mean ratio for the area under the curve was 1.44 (90% confidence interval 1.10-1.89) and for the maximum plasma concentration was 1.26 (90% confidence interval 1.06-1.48) vs. those with normal renal function. No new safety signals were detected in patients with mild or moderate renal impairment.ConclusionsIn patients with mild renal impairment, the small increase in exposure to olaparib was not considered clinically relevant. In patients with moderate renal impairment, exposure to olaparib increased by 44%; thus, these patients should be carefully monitored and the tablet dose should be adjusted to 200mg twice daily.Clinical Trials RegistrationNCT01894256.