Xencor's IL2-Fc Cytokine, XmAb®564, is Well-tolerated and Selectively Expands Regulatory T Cells in Phase 1a Clinical Study

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Nov 07, 2022

Xencor, Inc. (NASDAQ:XNCR), a clinical-stage biopharmaceutical company developing engineered antibodies and cytokines for the treatment of cancer and autoimmune diseases, today announced topline clinical data from its Phase 1a single-dose, healthy volunteer study of XmAb®564, in development for patients with autoimmune diseases. XmAb564 is a wholly owned, monovalent interleukin-2 Fc fusion protein (IL-2-Fc), engineered with dramatically lowered potency and heightened binding affinity for the IL-2 alpha receptor (CD25), resulting in selective activation of regulatory T cells (Tregs). Tregs combat autoimmunity by suppressing other immune cells from attacking normal tissue; however, in many autoimmune diseases, Tregs become dysregulated.