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Tumor cells acquire the ability to proliferate uncontrollably, resist apoptosis, sustain angiogenesis and evade immune surveillance. Signal transducer and activator of transcription (STAT) 3 regulates all of these processes in a surprisingly large number of human cancers. Consequently, the STAT3 protein is emerging as an ideal target for cancer therapy. This paper reports the generation of an oncolytic adenovirus (M4), which selectively blocks STAT3 signaling in tumor cells as a novel therapeutic strategy. M4 selectively replicated in tumor cells and expressed high levels of antisenseSTAT3complementary DNA during the late phase of the viral infection in a replication-dependent manner. The viral progeny yield of M4 in tumor cells was much higher than that of the parent adenoviral mutants, Ad5/dE1A. M4 effectively silencedSTAT3and its target genes in tumor cells while sparing normal cells and exhibited potent antitumoral efficacyin vitroandin vivo. Systemic administration of M4 significantly inhibited tumor growth in an orthotopic gastric carcinoma mouse model, eliminated abdominal cavity metastases and prolonged survival time. In summary, M4 has low toxicity and great potential as a therapeutic agent for different types of cancers.

A novel oncolytic adenovirus selectively silences the expression of tumor-associated STAT3 and exhibits potent antitumoral activity