Table 2.

Reported studies about the association of XRCC1-399 and BC risk.

Protective effect	Breast Cancer Association Consortium, 2006 [41]
	Saadat et al., 2008 [42]
Risk factor	Duel et al., 2001 [43]
	Moullan et al., 2003 [44]
	Smith et al., 2003 [39]
	Zhang et al., 2006 [45]
	Huang et al., 2009 [40]
	Sterpone et al., 2010 [20]