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Background: Pexa-Vec is a vaccinia virus engineered to express granulocyte-macrophage colony stimulating factor (GM-CSF), thereby stimulating direct oncolysis, tumor vascular disruption and anti-tumor immunity (Nat Rev Cancer 2009). Pexa-Vec was shown to replicate in metastatic tumors following intratumoral (IT) or intravenous (IV) administration (Lancet Oncol 2008; Nature 2011). Preclinical and clinical data suggest that Pexa-Vec-induced acute vascular disruption sensitizes tumors to anti-angiogenic effects of sorafenib (Mol Ther 2011). Methods: Treatment-refractory HCC patients received Pexa-Vec for 3 weeks (Day 1 IV, Day 8 IT and Day 22 IT) followed by sorafenib at Day 25. The primary objective of the study was to determine the safety of Pexa-Vec followed by sorafenib. Secondary objectives include disease …