SillaJen, Inc. announced that, the first patient has been enrolled in REN026, the Phase 1b clinical trial of Pexa-Vec (pexastimogene devacirepvec) in combination with cemiplimab (REGN2810) for the treatment of renal cell cancer (RCC). The first patient was enrolled in the United States, with expansion to sites in South Korea and Australia anticipated over the coming weeks. SillaJen is collaborating with Regeneron to evaluate Pexa-Vec, SillaJen's lead clinical candidate, in combination with Regeneron's cemiplimab, an anti-PD1 monoclonal antibody. The aim of the trial is to assess the safety and efficacy of the combination in patients with unresectable or metastatic renal cell carcinoma. The study will also investigate the immune modulating potential of Pexa-Vec given concurrently with checkpoint inhibitor therapy by evaluating multiple blood and tissue biomarkers.