An innovative open-label, crossover clinical study was used to investigate the excretion balance, pharmacokinetics, and metabolism of nemiralisib-an inhaled phosphoinositide 3-kinase delta inhibitor being developed for respiratory diseases. Six healthy men received a single intravenous microtracer of 10 g [C]nemiralisib with a concomitant inhaled nonradiolabeled 1000 g dose followed by an oral 800 g dose of [C]nemiralisib 14 days later. Complementary methods including accelerator mass spectrometry allowed characterization of a range of parameters including oral absorption (F), proportion of nemiralisib escaping gut wall metabolism (F), hepatic extraction (E), fraction of dose absorbed from inhaled dose (F), and renal clearance.
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