InflaRx N.V. announced the acceptance of their Investigational New Drug application by the U.S. Food and Drug Administration. The open IND will allow InflaRx to conduct a phase IIb study to determine efficacy and safety of IFX-1, a first-in-class anti-human complement factor C5a antibody, in patients with moderate or severe Hidradenitis Suppurativa. The randomized, double-blind and placebo-controlled multicenter study is planned to be conducted at approximately 50 sites in several countries and expected to enroll approximately 175 patients, divided equally into five cohorts. InflaRx intends to initiate the study in the first quarter of 2018. Hidradenitis Suppurativa (HS) is a painful, chronic and debilitating inflammatory skin disease. The study's primary goal is to evaluate the dose-response signal of IFX-1 in patients with HS according to the Hidradenitis Suppurativa Clinical Response (HiSCR) at week 16 during the study period. Secondary goals are assessment of further efficacy and patient-reported outcome parameters, as well as the safety and tolerability of IFX-1. After the placebo-controlled double-blind phase, the study will be extended into an open label extension phase to assess long-term efficacy and safety. The study will be coordinated by the principal investigator Prof. Dr. med. Evangelos J. Giamarellos-Bourboulis at the ATTIKON University Hospital in Athens, Greece.