Our Approach

Unleashing the full potential of immuno-oncology therapies

Current immuno-oncology (IO) therapies have curative potential for patients with cancer; however, their potential is significantly curtailed by systemic toxicity that results from activity of the therapeutic molecule outside the tumor microenvironment (TME). Our focus is to improve upon foundational mechanisms of IO by engineering monoclonal antibodies (mAbs), cytokines, and multifunctional molecules to be tumor-activated with the goal of developing products with an improved efficacy-to-toxicity ratio, or therapeutic index.

We are leveraging our geographically precise solutions (GPS) platform to rapidly engineer novel molecules, including antibodies, cytokines, and multifunctional molecules, that are designed to optimize their therapeutic index by localizing their activity inside tumors and limiting their activity in the periphery.

Our GPS Platform

Our geographically precise solutions (GPS) platform enables us to engineer a broad range of immune-modulatory molecules, including antibodies, cytokines, and multifunctional molecules, that contain masking domains that minimize the activity of these molecules outside of the tumor microenvironment (TME). The molecules are then designed to be turned on selectively in the TME where they are activated by the unique conditions in the TME, including the preferential activity of matrix metalloproteases (MMPs), which are enzymes that are essential for tumor growth and metastasis. Specifically, MMPs cleave a linker that connects the masking protein domain to the active agent. This separates the mask from the active agent, enabling the unmasked agent to promote an anti-tumor response within the TME. This approach is intended to bring the benefits of IO therapy to patients by minimizing peripheral toxicity while enhancing anti-tumor activity.

Systemically Active
Immunotherapies

Human body icon outlining an example of the effects of tumor-selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of non–tumor selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of non–tumor selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of non–tumor selective immunotherapies for a person with lung cancer

Lung Cancer Example

With existing therapeutic options, patients receive systemically active immunotherapy in order to treat tumors locally
The simulation of the immune system by currently available immunotherapies is not limited to the tumor, which can lead to severe side effects in organs and tissues
To minimize these systemic side effects, physicians may reduce the dose of the therapy which unfortunately, also reduces its efficacy within the tumor

Xilio Tumor-Activated
Immunotherapies

Human body icon outlining an example of the effects of tumor-selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of tumor-selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of tumor-selective immunotherapies for a person with lung cancer Human body icon outlining an example of the effects of tumor-selective immunotherapies for a person with lung cancer

Lung Cancer Example

Xilio’s technology unleashes the anti-tumor efficacy of immunotherapy predominantly at the tumor.
Xilio’s product candidates are designed to preferentially bind their targets in tumors while minimizing activity in healthy non-tumor tissues.
By utilizing therapies created by Xilio’s technology, a highly efficacious dose of the therapy may be administered with a low risk of side effects, potentially allowing more patients to benefit from immunotherapy treatment vs. non-tumor-activated options.

We have shown initial clinical validation of the ability of our GPS platform to develop tumor-activated antibodies and cytokines, as evidenced by our tumor-activated anti-CTLA-4 antibody, XTX101, and our tumor-activated IL-2, XTX202. In clinical studies, each of these investigational molecules have exhibited tumor-selective biological activity.

The reproducibility of these data, as evidenced by tumor-selective activity observed in preclinical studies with our engineered IL-12 cytokine, XTX301, highlights the potential breadth of application of our GPS platform to multiple structurally diverse cytokines or antibodies.

Leveraging our GPS platform, we intend to develop a number of additional product candidates using a range of tumor targeting approaches, with the goal of achieving a clinically meaningful improvement in their therapeutic index. We also plan to evaluate opportunities for better tolerated and more efficacious combination therapies, using product candidates from across our portfolio with other cancer therapies, to increase the potential for curative regimens in oncology. Beyond oncology, we also plan to apply our GPS platform to other disease areas in which the immune system is dysregulated, such as in autoimmune and inflammatory diseases.

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