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Oncolytics : Preclinical Data Shows Synergistic Immunotherapeutic Effects Of Pelareorep-Radiotherapy

Oncolytics Biotech Inc. (ONCY,ONC.TO) announced preclinical data demonstrating the synergistic immunotherapeutic effects of pelareorep combined with radiotherapy in a murine cancer model.

Preclinical studies presented in the poster evaluated various treatment combinations of pelareorep, ionizing radiation, and anti-PD-1 therapy in mice with two bilateral tumors, each located subcutaneously (under the skin) on a different side of the body.

Radiotherapy and/or pelareorep treatment was delivered locally to one tumor, while the second tumor (denoted the abscopal tumor) was not directly exposed to either therapy. Anti-PD-1 therapy was delivered systemically.

Results showed that in primary tumors, pelareorep monotherapy led to a numerical increase in the number of infiltrating anti-cancer CD8+ T cells, which reached statistical significance when combined with radiotherapy.

In abscopal tumors, both pelareorep monotherapy and pelareorep-radiation combination therapy led to a statistically significant increase in infiltrating anti-cancer CD8+ T cells. This effect was not seen with single-agent radiotherapy in either the primary or the abscopal tumors.

Local delivery of radiotherapy alone and the pelareorep-radiotherapy combination into primary tumors significantly improved survival compared to untreated controls.

Compared to single-agent radiotherapy, the pelareorep-radiotherapy combination led to a numerical increase in survival, which reached statistical significance when anti-PD-1 therapy was added to the treatment regimen.

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