On February 28, 2019 Oncolytics Biotech Inc. (NASDAQ: ONCY) (TSX: ONC), currently developing pelareorep, an intravenously delivered immuno-oncolytic virus, reported the publication of an abstract demonstrating a biomarker for predicting clinical response in patients treated with pelareorep (Press release, Oncolytics Biotech, FEB 28, 2019, View Source [SID1234533842]). This analysis was conducted in patient samples from REO 024; a study of pelareorep and Keytruda in combination with chemotherapy in patients with second-line pancreatic cancer. Detailed results will be presented at the American Association for Cancer Research (AACR) (Free AACR Whitepaper) Annual Meeting taking place March 30 through April 3 in Atlanta, Georgia.

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"With a simple blood draw, this biomarker data allows physicians to understand which patients are likely to respond to treatment, allowing for the design of clinical studies that are cheaper, faster and more likely to succeed," said Dr. Matt Coffey, President and CEO of Oncolytics Biotech. "Our biomarker data that we will present at AACR (Free AACR Whitepaper) is immediately applicable to future clinical studies. Investigators should now be able to predict which patients will respond to pelareorep in combination with a checkpoint inhibitor. This biomarker will be evaluated in our clinical studies with checkpoint inhibitors, including both of our multiple myeloma studies, the AWARE-1 breast cancer study, and importantly, in the same setting this data was produced, our phase two second-line pancreatic study in combination with Keytruda."

"Using patient blood samples from our REO 024 study in second line pancreatic cancer, T cell receptor sequencing was performed with Adaptive Biotechnologies’ immunoSEQ Assay to measure the diversity or clonality of the T cell population," said Dr. Rita Laeufle, CMO of Oncolytics Biotech. "Results from this analysis demonstrate that higher clonality after one three-week cycle of treatment can identify patients likely to respond to combination treatment of pelareorep and a checkpoint inhibitor."

The results suggest that those patients with a statistically significant change in their T cell population demonstrate a clinical benefit from pelareorep treatment. High T cell clonality correlates with progression free survival at baseline (HR=0.05, p=0.01). Moreover, high clonality correlates with overall survival at both baseline (HR=0.124, p=0.01) and after one cycle of treatment (HR=0.08, p=0.01). This research highlights the potential utility of measuring T cell clonality as a predictive and prognostic biomarker of pelareorep therapy.

The abstract, authored by Dr. Grey Wilkinson, a translational scientist at Oncolytics Biotech, and his colleagues, in collaboration with Northwestern University, UT Health San Antonio and Adaptive Biotechnologies can be found online at View Source!/6812/presentation/4866. Full details from the poster presentation will be announced after it is presented.

Poster Board Number: 1
Presentation Number: 2272
Title:
Exploratory analysis of T cell repertoire dynamics upon systemic treatment with the oncolytic virus pelareorep in combination with pembrolizumab and chemotherapy in patients with advanced pancreatic adenocarcinoma
Date:
Monday, April 1
Lecture Time: 1:00 p.m. ET – 5:00 p.m. ET
Location: Georgia World Congress Center, Exhibit Hall B, Poster Section 20
Speakers: Grey Wilkinson
Session Category:
Clinical Research

Session:
Current Developments in Non-invasive Biomarkers for Assessment of Cancer 3

About Pelareorep
Pelareorep is a non-pathogenic, proprietary isolate of the unmodified reovirus: a first-in-class intravenously delivered immuno-oncolytic virus for the treatment of solid tumors and hematological malignancies. The compound induces selective tumor lysis and promotes an inflamed tumor phenotype through innate and adaptive immune responses to treat a variety of cancers and has been demonstrated to be able to escape neutralizing antibodies found in patients.