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Promedior Announces Positive Long-term Safety and Efficacy Data from Open Label Extension Study of PRM-151 in Idiopathic Pulmonary Fibrosis

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Promedior, Inc., a clinical stage biotechnology company developing novel therapeutics for the treatment of fibrosis, today announced that positive safety and efficacy data from the Company's open-label extension study of PRM-151 in patients with Idiopathic Pulmonary Fibrosis (IPF) were simultaneously published in The Lancet Respiratory Medicine and presented at the American Thoracic Society 2019 International Conference. The Lancet Respiratory Medicine article, titled "Long-term treatment with recombinant human pentraxin 2 protein in patients with idiopathic pulmonary fibrosis: an open-label extension study," is available online here.

The 76-week open-label extension study of PRM-151 demonstrated evidence of sustained benefit with continued treatment with PRM-151 on the reduction in decline of forced vital capacity (FVC), and 6 minute walking distance (6MWD). These results were consistent with those observed during the 28-week double-blind period. In addition, a positive treatment effect was observed in patients who crossed over to PRM-151 from placebo.

"We are excited to present these positive long-term data for PRM-151 in IPF, a serious, life-limiting lung disease for which despite existing therapies, patient prognosis remains poor with a median survival of 3-5 years," said Jason Lettmann, Chief Executive Officer of Promedior. "These data continue to support the disease-modifying potential of PRM-151 in combating IPF and, ultimately, in the treatment of additional fibrotic diseases. We look forward to advancing into our pivotal program for PRM-151 in early 2020."

IPF Phase 2 Results
IPF patients in the placebo group when switched to treatment with PRM-151 demonstrated both a significant reduction in the rate of decline of FVC and in 6MWD. In addition, a persistent treatment effect of PRM-151 was observed in patients who continued treatment in the open-label extension period out to 76 weeks. In patients who switched to PRM-151 during the open-label extension study, the rate of decline in FVC percent predicted reduced from −8.7% per year while on placebo to −0.9% per year on PRM-151 (p < 0.0001). Importantly, this benefit was also observed in 6MWD which improved from −54.9 m per year on placebo to −3.5 m per year on PRM-151 (p=0.0224). The safety profile was consistent with prior studies of PRM-151 and with disease-related morbidities.

IPF Phase 2 Study Design
Patients who completed the Phase 2, 28-week double-blind period of the PRM-151-202 trial were eligible to participate in the open-label extension study. Patients previously enrolled in the PRM-151 group continued this treatment and those previously in the placebo group crossed over to PRM-151. All patients received PRM-151 in a dose of 10 mg/kg every 4 weeks.

The primary objective of the open-label extension study was to assess the long-term safety and tolerability of PRM-151, which were assessed by analyzing adverse events (AEs) up to week 76 in all patients who received at least one dose of PRM-151 during the open-label extension study. Exploratory efficacy analyses were done by assessing changes from baseline in percentage of predicted FVC and 6MWD, with descriptive statistics to week 76 and with random-intercept mixed models to week 52.

The open-label extension study analyzed 111 patients (74 from the PRM-151 group and 37 from the placebo group) of the 116 patients who completed the double-blind treatment period. 84 (76%) of 111 patients received concomitant IPF therapy (pirfenidone n=55 or nintedanib n=29).