Distal myopathy with rimmed vacuoles (DMRV) is an extremely rare disease where atrophy begins in muscles separate from the body trunk. Patients with this disease have mutations in the enzyme gene called GNE, and cannot sufficiently synthesis N-acetylneuramic acid. At the Department of Neuromuscular Research, National Center of Neurology and Psychiatry, DMRV model mice were prepared and administered N-acetylneuramic acid before onset. Change in motion capability and muscle histopathology to the same level as normal mice was observed.

In consideration of the above, an investigator-initiated clinical trial to develop N-acetylneuramic acid as a therapeutic agent was carried out for the first time in the world. Phase I trial has been completed, Phase II and III trials are underway, and an international joint research focusing on results from clinical tests carried out overseas with the same protocols is being carried out.