A Study of Bermekimab for the Treatment of Participants With Moderate to Severe Hidradenitis Suppurativa

Hidradenitis suppurativa (HS) is a chronic skin disease of unclear etiology that affects 1 percent (%) to 4% of the general population. JNJ-77474462 (bermekimab) is a recombinant human immunoglobulin G1 kappa (IgG1k) monoclonal antibody (mAb) that binds with high affinity and selectivity for human interleukin-1 alpha (IL-1 alpha) and is an effective blocker of IL-1 alpha biological activity. IL-1 alpha is a key mediator of sterile inflammatory responses. Skin is a significant reservoir of preformed IL-1 alpha, and it has been postulated that IL-1 alpha may play a role in the pathophysiology of multiple inflammatory skin disorders, including HS. Part 1 of this study contains 4 study periods: up to 6 weeks screening period (Period 1), 16-week placebo-controlled period (Period 2), 16-week cross over period (Period 3), and 4-week safety follow-up (Period 4). Part 2 of this study also contains 4 study periods: up to 6 weeks screening period (Period 1), 12-week placebo-controlled period (Period 2), 20-week cross over period (Period 3), and 4-week safety follow up (Period 4). Safety will be assessed by adverse events (AEs), serious adverse event (SAEs), physical examinations, vital signs, electrocardiograms, clinical safety laboratory assessments, allergic reaction, injection-site reactions, and tuberculosis evaluations. The total duration of study participation will be up to 42 weeks.