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“Background Gastric cancer is one of the most prevalent malignant tumors, especially in Asia [1]. Although early detection methods, development of endoscopic or surgical resection, and more effective chemotherapies have improved the overall survival in patients with gastric cancer, the prognosis of patients with advanced gastric cancer is still poor [2–4]. Most conventional chemotherapy treatments have demonstrated

moderate efficiency. One possible explanation Sirolimus for the resistance of gastric cancer to conventional therapy might be its non-susceptibility to apoptosis [5]. However, oncolytic viruses have great therapeutic effects against cancer cells which express high levels of ribonucleotide reductase, DNA-repair enzymes, and are thus resistant to apoptosis [6, 7]. Many of these characteristics which make gastric cancer cells resistant to chemotherapy, make them susceptible to oncolytic viral therapy. Thus, gene therapy using oncolytic virus offers an attractive alternative for the treatment of gastric cancer [8]. Oncolytic viral therapy has been studied over the past century and shown success in preclinical and clinical testing as a novel cancer treatment modality [9]. Vaccinia virus (VACV) strains are particularly attractive as potential antitumor agents, as they can incorporate large amounts of foreign DNA without reducing their replication efficiency. Moreover, VACV has shown a great safety profile in humans [10–12].