Otonomy, Inc., a clinical stage biopharmaceutical company developing innovative therapeutics for diseases and disorders of the inner and middle ear, today announced that researchers presented positive new data from a Phase 1b study of the company's lead product candidate, OTO-104, in patients with Meniere's disease. The presented data showed that patients treated with OTO-104 experienced clinically meaningful reductions in vertigo frequency and improvements in tinnitus as compared to placebo. These results were presented today in an oral presentation at the 28th Politzer Society Meeting in Athens, Greece.
Researchers presented findings showing clinically meaningful reductions in vertigo frequency at three months with the 12 mg OTO-104 dose as compared to placebo. Prior to treatment, patients in both the 12 mg OTO-104 and placebo groups experienced an average of eight days with definitive vertigo episodes during a baseline period of one month. Following a single intratympanic (IT) injection, patients in the 12 mg OTO-104 group experienced a month-over-month reduction in vertigo frequency throughout the three month follow-up period, and achieved an approximate six day reduction in the number of definitive vertigo days in the third month versus baseline. When compared to placebo, at three months following treatment, the 12 mg study group experienced a 70 percent greater reduction from baseline in the number of days with definitive vertigo episodes. There was no clinically meaningful difference in vertigo frequency between the 3 mg OTO-104 and placebo groups at three months following treatment.
Additionally, the presented study data demonstrated that both the 3 mg and 12 mg OTO-104 doses were associated with improvement in tinnitus as measured by the Tinnitus Handicap Inventory (THI-25). THI is a clinically validated patient-reported measure that can be used to quantify the impact of tinnitus on activities of daily living. Both OTO-104 doses resulted in reductions in THI Total Score from baseline as early as one month following treatment. Furthermore, these THI Total Scores continued to decrease throughout the entire three month follow-up period, suggesting continued improvement in tinnitus symptoms experienced by patients treated with OTO-104. By contrast, the study's placebo group demonstrated little change in THI Total Score from baseline during the three month follow-up period.
As previously reported, results from this study showed OTO-104 to be safe and well-tolerated at both doses tested when delivered via a single IT injection. It is important to note that despite demonstrating meaningful clinical activity in the areas of vertigo and tinnitus, this study was not powered to demonstrate statistical significance. Based on these study results, Otonomy will initiate a Phase 2 clinical trial of OTO-104 in Meniere's disease during the fourth quarter of 2011.
"These new results provide the first demonstration of OTO-104's clinical activity in a cohort of Meniere's disease patients experiencing frequent vertigo episodes," stated Paul R. Lambert, M.D., professor and chair of the department of otolaryngology – head and neck surgery, Medical University of South Carolina, and the study's lead investigator. "Furthermore, the continued reduction in vertigo frequency and improvement in tinnitus symptoms for the 12 mg OTO-104 group observed through three months of follow-up provides a strong rationale for initiating broader clinical evaluations of this sustained release product."
A total of 44 patients with unilateral Meniere's disease were enrolled in this prospective, randomized, double-blind, placebo-controlled multicenter study. Patients participated in a one-month baseline period to characterize disease status, followed by randomization to receive a single IT injection of OTO-104 (3 mg or 12 mg) or placebo. Patients were monitored over a three-month observation period following injection. The study's primary objective was the evaluation of the safety and tolerability of OTO-104. Additionally, the study evaluated various indicators of OTO-104 clinical activity including changes in vertigo, tinnitus, hearing function and patient quality of life.
"Following a meeting with the United States Food and Drug Administration regarding these Phase 1b results and our proposed plans for continued clinical development of OTO-104, we are now in a strong position to move this program forward," said David A. Weber, Ph.D., president and chief executive officer of Otonomy. "Importantly, our upcoming Phase 2 study will include a much greater number of patients and be powered to deliver statistically significant findings with regard to clinical efficacy. As such, we look forward to the initiation of this study as we seek to establish the therapeutic potential of OTO-104 to help patients suffering from the debilitating symptoms of Meniere's disease."