February 19, 2014
Omeros Corporation today announced dosing of the first patient in a second Phase 2 clinical trial of OMS824, the company’s phosphodiesterase 10 (PDE10) inhibitor being developed for the treatment of schizophrenia, Huntington’s disease (HD) and other cognitive disorders. The Phase 2 trial will evaluate the tolerability, safety, pharmacokinetics and performance on a battery of tests in patients with symptomatic HD.
Omeros previously reported results from its successful Phase 2 trial of OMS824 in patients with schizophrenia. This second Phase 2 trial will enroll approximately 120 patients with Huntington’s disease who will be randomized to receive placebo or one of three doses of OMS824. The dose levels were selected based on tolerability and PDE10 target occupancy results in Phase 1 studies conducted in healthy subjects. The doses evaluated in this Phase 2 trial are expected to be well tolerated and cover a range of PDE10 target occupancy in the brain. Efficacy will be assessed across three functional domains that are affected by the disease: motor, cognitive, and behavior. Patients in the trial are allowed to continue their usual medications based on the results of the earlier Phase 2 trial in which schizophrenia patients who took similar classes of drugs had no untoward interactions with OMS824. Interim results are expected in the second half of this year with final data projected to be available in 2015.
Huntington’s disease is estimated to affect approximately 31,000 patients in the U.S. The only drug approved by the U.S. Food and Drug Administration (FDA) to treat the disease is tetrabenazine, which is indicated for Huntington’s-related movement disorders. OMS824 has the potential to improve the cognitive and psychiatric abnormalities as well as the movement disorders associated with the disease. Omeros has been awarded Orphan Drug designation by the FDA to evaluate OMS824 in HD and recently received Fast Track designation from the FDA for the development of OMS824 to treat cognitive impairment in HD.
Omeros recently announced that approximately 70-percent engagement at PDE10 was achieved in the positron emission tomography (PET) trial following dosing with OMS824 without evidence of extrapyramidal symptoms (EPS). There is currently one other PDE10 inhibitor being evaluated in patients with HD. Based on available information, OMS824 achieves greater PDE10 target occupancy without EPS than does any other PDE10 inhibitor previously or currently in development. Since the maximally tolerated dose of OMS824 has not been reached, Omeros plans to evaluate a higher dose of OMS824 in the PET trial to determine whether an even higher level of PDE10 occupancy can be achieved.
About Omeros’ PDE10 Program
PDE10 is an enzyme that is expressed in areas of the brain linked to diseases that affect cognition and psychomotor functions, including Huntington’s disease and schizophrenia. Huntington’s disease is a hereditary neurodegenerative disorder that leads to movement, cognition, and behavioral abnormalities and premature death. Schizophrenia is a group of severe brain disorders characterized by an abnormal interpretation of reality, which can manifest as delusions, hallucinations, and/or disordered thinking and behavior. Cognitive dysfunction is responsible for substantial disability in both of these diseases and is not meaningfully improved by current medications. Omeros’ proprietary compound OMS824, currently in Phase 2 clinical programs, inhibits PDE10 and is being developed for the treatment of cognitive disorders. In addition to potential benefits on cognition, OMS824 could also improve the motor and psychiatric abnormalities in Huntington’s disease as well as the positive (e.g., hallucinations) and negative (e.g., flat affect) symptoms of schizophrenia. Omeros has been awarded Orphan Drug designation by the US FDA to evaluate OMS824 in Huntington’s disease, and received Fast Track designation from the FDA for the development of OMS824 to treat cognitive impairment in Huntington’s disease. An application for Fast Track designation for the evaluation of OMS824 in schizophrenia is currently under FDA review.
See the full press release here.