Asher Bio is applying our cis-targeting platform to address inherent limitations in activity and tolerability that have restricted the therapeutic potential of cytokines and other immunomodulators

We are focused on progressing our most advanced cis-targeted immunotherapies, AB248 and AB821, into clinical development. AB248 is a novel CD8+ T cell selective interleukin-2 (IL-2), specifically engineered to activate and expand CD8+ T-cells, tumor killing T cells, while avoiding natural killer cells and regulatory T (Treg) cells. AB821 is a CD8-targeted interleukin 21 (IL-21), designed to selectively activate CD8+ T cells via a pathway distinct from and complementary to IL-2. IL-21 enables T cells to kill tumor cells more effectively by enhancing their cytotoxic function.

Beyond AB248 and AB821, we have rapidly developed and are advancing a pipeline of immunotherapies to address patient populations with unmet medical needs. While our primary focus is on oncology, the modular nature of our cis-targeting platform allows us to leverage other immunomodulators and immune cell types to expand into additional therapeutic areas including infectious and autoimmune diseases.

Given the potential applicability of our platform to a variety of targets and indications, we are exploring opportunities to enter into strategic collaborations to access capabilities outside our core areas of focus and accelerate delivering therapies to patients.

Pipeline Chart

AB248 is currently being studied in an open-label Phase 1a/1b clinical trial, which consists of a dose escalation and expansion stage, evaluating AB248 as a monotherapy and in combination with KEYTRUDA® (pembrolizumab) in patients with recurrent locally advanced or metastatic solid tumors, including melanoma, renal cell carcinoma (RCC), non-small cell lung cancer (NSCLC) and squamous cell carcinoma of the head and neck (SCCHN).

Please refer to (NCT05653882) for additional details related to this Phase 1a/1b clinical trial.


Our lead cis-targeted immunotherapy, AB248, selectively activates the IL-2 receptor on CD8+ T cells stimulating proliferation, and has shown highly compelling preclinical efficacy.




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