Immune-Onc Therapeutics Receives FDA Fast Track Designation for IO-202, the First Anti-LILRB4 Myeloid Checkpoint Inhibitor, for the Treatment of Relapsed or Refractory Acute Myeloid Leukemia (AML)

Immune-Onc Therapeutics, Inc. (“Immune-Onc”), a clinical-stage cancer immunotherapy company developing novel biotherapeutics targeting immunosuppressive myeloid checkpoints, today announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track designation for IO-202, a first-in-class myeloid checkpoint inhibitor targeting leukocyte immunoglobulin-like receptor B4 (LILRB4, also known as ILT3) for the treatment of patients with relapsed or refractory acute myeloid leukemia (AML). The Company received Orphan Drug Designation for IO-202 for the treatment of AML in 2020.

“We are pleased that the FDA has granted IO-202 Fast Track designation in recognition of its potential to improve outcomes for people with relapsed or refractory AML,” said Paul Woodard, Ph.D., chief medical officer of Immune-Onc. “We look forward to working closely with the FDA to accelerate the clinical development of IO-202, which is currently being evaluated as a monotherapy and in combination with other agents in a Phase 1 dose escalation and expansion trial in patients with AML with monocytic differentiation and in chronic myelomonocytic leukemia (CMML).”

The FDA’s Fast Track designation is designed to facilitate the development and expedite the review of drugs to treat serious conditions and fill an unmet medical need to get important new medicines to patients earlier. Drugs that receive Fast Track designation may be eligible for more frequent interactions and written communications with the FDA to discuss the development plan and data collection to support an approval pathway. The designation also supports the eligibility for Accelerated Approval and Priority Review if relevant criteria are met.

ABOUT LILRB4 (also known as ILT3)

LILRB4, also known as ILT3, is an immune inhibitory transmembrane protein found on monocytic myeloid cells, including dendritic cells. LILRB4 inhibits antigen-presenting cell activation, resulting in immune tolerance. LILRB4 is also expressed on certain hematologic cancer cells and monocytic myeloid cells in the solid tumor microenvironment. Immune-Onc and The University of Texas published pioneering research in Nature illuminating the role of LILRB4 in immune suppression and tumor infiltration in AML and presented the rationale for targeting LILRB4 in solid tumors at the AACR Annual Meeting 2021.


IO-202 is a first-in-class LILRB4 antagonist antibody with broad potential as an immunotherapy in both blood cancers and solid tumors. In hematologic malignancies, preclinical studies showed that IO-202 converts a “don’t kill me” to a “kill me” signal by activating T cell killing and converts a “don’t find me” to a “find me” signal by inhibiting infiltration of blood cancer cells. In solid tumors, preclinical data showed that IO-202 enhances dendritic cell function and T cell activation in vitro and inhibits tumor growth in a solid tumor model in vivo.

IO-202 is currently in Phase 1 clinical development for the treatment of AML and CMML. The U.S. Food and Drug Administration granted IO-202 Orphan Drug Designations for treatment of AML in 2020. The company has received IND clearance to evaluate IO-202 in solid tumors in January 2022.


Immune-Onc Therapeutics, Inc. (“Immune-Onc”) is a clinical-stage cancer immunotherapy company dedicated to the discovery and development of novel myeloid checkpoint inhibitors for cancer patients. The company aims to translate unique scientific insights in myeloid cell biology and immune inhibitory receptors to discover and develop first-in-class biotherapeutics that disarm immune suppression in the tumor microenvironment.

Immune-Onc has a differentiated pipeline with a current focus on targeting the leukocyte immunoglobulin-like receptor subfamily B (LILRB) of myeloid checkpoints. Immune-Onc’s focused platform approach has led to the development of several promising therapeutics across various stages of development. In addition to advancing IO-202, a first-in-class antagonist antibody targeting LILRB4 (ILT3), into the clinic in 2020, Immune-Onc has advanced IO-108, an antagonist antibody targeting LILRB2 (ILT4), into the clinic for solid tumors in 2021. Additional assets in Immune-Onc’s pipeline include IO-106, a first-in-class antagonist antibody targeting LAIR1, and multiple undisclosed programs for solid tumors and hematologic malignancies.

The company has strategic research collaborations with The University of Texas, Albert Einstein College of Medicine, and Memorial Sloan Kettering Cancer Center, and has invested in proprietary models, assays, and tools to interrogate the biology and translate this cutting-edge research into the development of novel therapies. Immune-Onc has received research grants from the National Cancer Institute (NCI) of the National Institutes of Health (NIH) and the California Institute for Regenerative Medicine (CIRM) and a strategic investment from The Leukemia & Lymphoma Society Therapy Acceleration Program® (LLS TAP®). Headquartered in Palo Alto, California, Immune-Onc has assembled a diverse team with deep expertise in drug development and proven track records of success at leading biotechnology companies. For more information, please visit and follow us on Twitter and LinkedIn.

We’re excited to share that the FDA has granted Fast Track Designation for IO-202, the first anti-LILRB4 myeloid checkpoint inhibitor, for the treatment of relapsed or refractory acute myeloid leukemia #AML #cancer #myeloid #checkpoint #immunotherapy #ILT3


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