Phase I clinical trial results of aceneuramic acid for GNE myopathy in Japan
Tóm tắt
GNE myopathy (distal myopathy with rimmed vacuoles) is a rare intractable muscle disease caused by the mutations in GNE gene, with no therapeutic agents at present. The mutations in GNE (UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase) gene result in a deficiency of the biosynthesis of aceneuramic acid. Aceneuramic acid improves the phenotype of GNE myopathy model mice. We examined the pharmacokinetics and safety of aceneuramic acid therapy in a nonrandomized manner for patients with GNE myopathy for the first time in humans. This article was based on the world’s first Phase I trial and the additional Phase I trial that began at a time when the intermediate results of an overseas Phase II trial were ascertained. In the first trial, conventional tablets without controlled release were administered orally in a single dose of 800 mg, in 800 mg/doses given three times in 1 day, and in 800 mg/doses given three times per day for 5 days. Serum and urinary concentrations of total aceneuramic acid including aceneuramic acid bound to proteins and lipids were measured. Subsequently, administering extended-release tablets to patients with GNE myopathy, we investigated the pharmacokinetics and safety of a single 2000 mg dose, three doses given for 1 day, and three doses per day for 7 days. The results of the first trial showed no obvious increase in serum concentration after administration. Whereas the amount of aceneuramic acid excreted in the urine generally increased with all given doses, although there were variations among trial subjects. In the second trial, we measured free serum aceneuramic acid levels, and with all doses given there were obvious increases in the levels observed after administration. The degrees of increase were comparable with other studies conducted overseas, and there was no difference based on ethnicity. With regards to urinary excretion, free aceneuramic acid levels showed elevated levels in all patients, and total aceneuramic acid also increased in general, thus we could confirm the absorption of the investigational drug. In respect to safety, while some adverse events including abnormal laboratory test findings were observed, all events were mild and the causal relationship with the investigational drug was ruled out or unlikely. The elevated serum concentration of aceneuramic acid and safety were confirmed. We decided that the trial could shift to the next level to examine the long-term efficacy and safety for Japanese patients as well.
NCT01236898
,
UMIN000011532
. Registered 9 November 2010.
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