Microwave ablation combined with attenuated Salmonella typhimurium for treating hepatocellular carcinoma in a rat model
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Qing Zhao1,*, Xudong Qu1,3,*, Kai Liu2,*, Huibin Shi1,3,*, Guowei Yang1,3, Bo Zhou1,3, Liang Zhu1,3, Wei Zhang1,3, Zhiping Yan1,3, Rong Liu1,3, Sheng Qian1,3 and Jianhua Wang1,3
1Department of Interventional Radiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
2Department of Radiology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China
3Shanghai Institute of Medical Imaging, Shanghai, 200032, China
*These authors have contributed equally to this work
Rong Liu, email: firstname.lastname@example.org
Sheng Qian, email: email@example.com
Jianhua Wang, email: firstname.lastname@example.org
Keywords: hepatocellular carcinoma, VNP 20009, microwave ablation
Received: December 15, 2016 Accepted: April 11, 2017 Published: April 27, 2017
We aim to investigate the safety and efficacy of microwave ablation (MWA) combined with attenuated Salmonella typhimurium strain VNP20009 in treating hepatocellular carcinoma. Portions of tumor tissues were orthotopically implanted in the livers of 40 male rats weighed 150~200 g to establish tumor models. Three weeks later, the rats were randomly divided into four groups: (A) MWA plus VNP20009 group; (B) MWA group; (C) VNP20009 group; and (D) control group. Incomplete MWA was performed (20~30 W, 1~2 min) after the hepatic carcinoma was properly exposed. VNP20009 (about 1×107 cfu) was directly injected into the tumor immediately. MRI scans were performed to assess the tumor responses 7 and 14 days later, respectively. Micro CT was used to observe the lung metastases. After the animals were sacrificed or died, the tumors were cut off for the purpose of pathological and immunohistochemical analyses. The results showed that the mean tumor volumes of MWA plus VNP20009 group on the 7th and 14th day post treatment were obviously smaller than those of other groups (P < 0.05). Lung metastases rates were 20%, 60%, 30% and 100% in MWA plus VNP20009 group, MWA group, VNP20009 group and control group, respectively. The median survival of the rats in MWA plus VNP20009 group was distinctly longer than those in other groups (P < 0.05). In summary, MWA combined with VNP20009 produced better effects than MWA or VNP20009 alone in treating hepatic carcinoma. This strategy might have potential ability to decrease lung metastases and prolong the overall survival.
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