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  • 9 October 2017
    Arsanis Presents Phase 1 and Preclinical Pharmacokinetic Data on Lead Product Candidate, ASN100, at IDWeek™ 2017

    Arsanis, Inc., a clinical-stage biopharmaceutical company focused on applying monoclonal antibody immunotherapies to address serious infectious diseases, today announced that the company presented pharmacokinetic data from a Phase 1 clinical trial in healthy volunteers and from a preclinical model of Staphylococcus aureus pneumonia for its investigational lead product candidate, ASN100, which is currently in a Phase 2 clinical trial for the prevention of S. aureus pneumonia in high-risk, mechanically ventilated patients. These data were described in three poster presentations at IDWeek™ 2017, taking place in San Diego from October 4 – 8. 

    “The clinical and preclinical data presented at IDWeek 2017 continue to build on a growing body of evidence supporting the development of our lead candidate, ASN100, as a potential first-in-class monoclonal antibody therapeutic with a non-antibiotic mechanism of action,” said Chris Stevens, M.D., Chief Medical Officer of Arsanis. “We previously reported that in its first-in-human Phase 1 clinical trial, ASN100 was well tolerated and no dose-limiting toxicities were observed. At IDWeek, we reported additional data from this trial confirming that significant lung concentrations of ASN100 were detected in lung epithelial lining fluid (ELF) of healthy volunteers within 1 day and out to 30 days after dosing. We believe that this is the first report of an intravenously administered human IgG1 mAb measured in ELF in humans. In addition, we presented results from the ASN100 Phase 1 population PK model. Together these data support the single dose regimen in our ongoing Phase 2 clinical trial. We also reported ASN100 data in a rabbit model of S. aureus pneumonia in which ASN100 mAbs demonstrated rapid penetration into ELF in both uninfected and S. aureus infected animals, and induced dose-dependent protection from lethal pneumonia and improved tissue pathology across multiple strains tested.”

    Summary of Posters

    Serum and Lung Pharmacokinetics of ASN100, a Monoclonal Antibody Combination for the Prevention and Treatment of Staphylococcus aureus Pneumonia. Poster #1025.

    Twelve healthy volunteers received ASN100 open-label at doses of 3600 mg or 8000 mg. Each subject underwent two bronchoalveolar lavage (BAL) samplings either on days 1 and 30 or on days 2 and 8 postdosing. A dose proportional increase in serum peak and exposure (AUC) of ASN100 mAbs ASN-1 and ASN-2 was observed, with an approximate half-life for each antibody of 3 weeks. Penetration of ASN-1 and ASN-2 into the lung ELF was observed at the first post-dose time point of 24 hours and both mAbs remained detectable at significant lung concentrations at day 30 post-dose.

    Population Pharmacokinetic Model for Intravenous ASN100 in Healthy Subjects. Poster #1849.

    Pharmacokinetic data from a previously reported ASN100 Phase 1 trial were incorporated into a twocompartment physiologic based pharmacokinetic (PK) model. This population PK model simulated various ASN100 dosing regimens to support dose selection for the ongoing Phase 2 clinical trial.

    Prevention of Lung Pathology and Mortality in Rabbit Staphylococcus aureus Pneumonia with CytotoxinNeutralizing Monoclonal IgGs that Penetrate Epithelial Lining Fluid. Poster #1844.

    ASN100 was tested in a rabbit model of the prevention of lethal S. aureus pneumonia. ASN100 at an intravenous dose of 5 or 20 mg/kg afforded 100% survival in rabbits across all four S. aureus strains tested. The ASN100 mAbs rapidly penetrated the lung ELF in uninfected and S. aureus infected animals, reaching peak levels at 48 hours post dose. Importantly, free ASN-1 and ASN-2 serum and ELF levels were not depleted in the lungs of S. aureus infected rabbits despite the presence of bacteria for up to three days post challenge