Chelsea Therapeutics (CHTP) Says Northera Meets Primary Endpoint

December 4, 2012 4:07 PM EST
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Chelsea Therapeutics International, Ltd. (Nasdaq: CHTP) announced positive preliminary results for Study 306B, a Phase III trial evaluating the safety and efficacy of investigational drug Northeraâ„¢ (droxidopa) for the treatment of symptomatic neurogenic orthostatic hypotension (NOH) associated with Parkinson's Disease (PD), including achievement of the study's pre-defined, pre-specified primary endpoint.

The results showed that treatment with Northera provided clinically meaningful and statistically significant improvements compared to placebo in dizziness/lightheadedness at week 1 (1.0 unit change; p=0.018), the primary endpoint. In addition, compared to placebo, a statistically significantly greater number of patients were observed to experience 2, 3 or 4 unit improvements at week 1 compared to baseline (all p-values<0.05). Study results also demonstrated a statistically significant increase in standing systolic blood pressure (SBP) at week 1 (5.6 mmHg; p=0.032), a key secondary endpoint of the study. At time points beyond week 1, dizziness/lightheadedness and standing blood pressure predominantly favored Northera-treated patients, although the results were not statistically significant.

Treatment with Northera also resulted in a reduction in the rate of patient falls over the course of the study, although these results were not statistically significant. Patients receiving placebo experienced a rate of falls per patient per week of 2.0 vs. 0.4 for those on Northera, an 80% reduction. Because several patients on placebo experienced a very large number of falls, Chelsea performed multiple sensitivity analyses on this outcome. These analyses showed that the beneficial effect of Northera on falls was evident even if the top 2, 5 or 10 fallers from each treatment group were removed (34%, 36% and 29% reduction, respectively, p=NS). Importantly, the falls data were supported by additional safety data showing that 34% fewer patients receiving Northera experienced fall-related injuries (e.g., contusions, lacerations, fractures) than patients receiving placebo (placebo=25.6% vs. Northera=16.9%, p=NS). Both the reduction in falls and fall-related injuries associated with Northera are consistent with results observed in Study 306A.

Patient falls are the leading cause of death in the elderly, and for PD patients, injuries sustained due to falls are the primary reason for being admitted to the hospital.

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