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no competing interests. Authors’ contributions XLZ performed the experiments and analyzed the data. ZFW and WBL participated in the experiments. HWZ contributed to the acquisition of the data, WJH and YHW has made substantial contribution to collected tissue samples, XLZ and WPW wrote the manuscript, WPW conceived and designed the experiment. All authors have read and approved the final manuscript.”
“Background Hepatocellular carcinoma (HCC) is one of the most common cancers in the world. The overall five-year survival rate following resection has remained as poor as 35–50% [1–3]. The extremely poor prognosis of HCC is largely the result of a high rate of recurrence after surgery and of metastasis [4, 5]. Lung is the most common site for extrahepatic recurrence of HCC. The incidence of pulmonary metastasis after hepatic resection for HCC ranges from 37% to 58% [6]. Therefore, to reduce the pulmonary metastasis could ameliorate the prognosis of HCC. Transforming growth factor beta (TGF β) is a known regulator of epithelial cell, autonomous tumor initiation, progression and metastasis [7–9].