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F-652 + systemic corticosteroids is a combination therapy consisting of F-652—a recombinant fusion protein dimer of human interleukin-22 (IL-22) and immunoglobulin G2 Fc fragment—with systemic corticosteroids (such as methylprednisolone or prednisone) used for immunosuppression. F-652 acts as an **interleukin-22 receptor agonist**, promoting epithelial regeneration, suppressing inflammation, and upregulating antimicrobial molecules. The combination with corticosteroids aims to augment mucosal healing in diseases characterized by immune-mediated epithelial damage, notably **acute lower gastrointestinal graft-versus-host disease (GI GVHD)**. Clinical data demonstrate that this combination is safe, with a 70% day-28 response rate in a phase 2 trial for newly diagnosed lower GI acute GVHD, and is associated with improved mucosal recovery and gut microbial diversity.
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