Systematic review of surgical resection vs radiofrequency ablation for hepatocellular carcinoma

Table 2 Summary of published articles that directly compared hepatic resection and radio-frequency ablation identified through literature search

Ref.	Study period	Type of study	NOS
Feng et al[35]	2005-2008	RCT	-
Peng et al[36]	2003-2008	Retrospective	7
Wang et al[37]	2002-2009	Retrospective	6
Ruzzenente et al[47]	1995-2009	Retrospective	8
Nishikawa et al[42]	2004-2010	Retrospective	7
Hung et al[38]	2002-2007	Retrospective	7
Takayama et al[39]	2000-2003	Retrospective	5
Huang et al[34]	2003-2005	RCT	-
Ueno et al[41]	2000-2005	Retrospective	7
Abu-Hilal et al[48]	1991-2003	Retrospective	8
Guglielmi et al[43]	1996-2006	Retrospective	7
Hiraoka et al[40]	2000-2007	Retrospective	7
Hasegawa et al[46]	2000-2003	Survey	6
Lupo et al[45]	1999-2006	Retrospective	8
Chen et al[33]	1999-2004	RCT	-
Ogihara et al[49]	1995-2003	Retrospective	7
Montorsi et al[50]	1997-2003	Retrospective	6
Hong et al[51]	1999-2001	Retrospective	6
Vivarelli et al[44]	1998-2002	Retrospective	5

The Newcastle-Ottawa Score (NOS) scale can range from 5 to 9. RCT: Randomized controlled trials.