Palleon Presents Data on Sialoglycan Degradation Platform That Enhances Anti-Tumor T-Cell Immunity

- Preclinical studies indicate EAGLE therapeutic candidates enhance activation of T cells and restore exhausted T cells by desialylation –

- Lead candidate E-602 demonstrated single-agent antitumor activity and wide safety margin in animal models -

Palleon Pharmaceuticals, a company pioneering the field of glyco-immunology to treat cancer and inflammatory diseases, today presented data on a novel mechanism of action of the company’s EAGLE sialoglycan degradation therapeutic platform. Preclinical studies, presented in a poster at the 36th Annual Meeting of the Society for Immunotherapy of Cancer (SITC), show that EAGLE therapeutic candidates’ desialylation of T cells enhances T cell anti-tumor immunity, and that lead candidate E-602 (Bi-Sialidase) is efficacious and safe in animal models.

“The exciting package of data we are presenting at SITC demonstrates for the first time that Palleon’s EAGLE platform could offer a novel immunomodulatory approach to enhancing T-cell immunity for cancer treatment,” said Li Peng, Ph.D., Chief Scientific Officer of Palleon and the poster’s principal author. “These findings will bolster our upcoming IND filing for E-602 and continue to deepen our understanding of the therapeutic potential of the EAGLE platform.”

Upregulation of sialoglycans on tumors has been observed for decades and correlates with poor clinical outcomes across many tumor types. Recent findings made possible by advances in the tools used to study glycobiology have shown that these sialoglycans are immunosuppressive. In addition to tumor cells, most immune cells present substantially more abundant sialoglycans than non-hematological healthy cells, which may also contribute to immunosuppression. Palleon utilized various assays to study the effect of E-602 on naïve, exhausted, and effector T cells. These studies found that desialylation by E-602 enhanced naïve T cell priming/activation, restored exhausted-like T cell functions, and enhanced effector T cell function.

Further studies evaluated the single-agent antitumor activity of E-602 in multiple syngeneic mouse tumor models, and its safety profile in rat and non-human primate models. These studies found that E-602 demonstrated single-agent antitumor activity and a wide safety margin.

About Palleon Pharmaceuticals

Palleon Pharmaceuticals is the leading biotechnology company developing drugs that harness glyco-immunology to treat cancer and inflammatory diseases. The company’s proprietary platforms overcome scientific hurdles that limited progress in the glycobiology field to create novel therapeutics for devastating diseases characterized by immune system dysfunction. Palleon’s lead program in oncology, E-602, is an enzymatic degrader of immunosuppressive sialoglycans on tumors and immune cells which is expected to enter clinical testing in refractory cancer patients in early 2022. www.palleonpharma.com.

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