Table 1.

Local recurrence rates and corresponding threshold distances for negative margins are indicated for each study.

Study	Surgical margins	Local recurrences
Horiguchi et al., 2002 [9]	5 mm	3.2%
Karasawa et al., 2003 [10]	5 mm	1.7%
Perez, 2003 [11]	3 mm	5.8%
Peterson et al., 1999 [8]	2 mm	12.8% (*)
Santiago et al., 2004 [12]	2 mm	12.2%
Karasawa et al., 2005 [13]	2 mm (2.1–5 mm)	3.4% (6.3%)
Gage et al., 1996 [5]	1 mm	10.5% (*)
Park et al., 2000 [7]	1 mm	16% (*)
Kreike et al., 2008 [14]	1 mm	11.5%

*Average percentage calculated from single LRRs for each type of margins status.