RAD51C and mucositis: - Association was found between the presence of the XRCC3c.562-14 A>G (rs1415120657) polymorphism and the risk of severe acute mucositis (adjusted OR = 1.96; p = 0.178). - One variant allele of Rad51c.-3392 was associated with a small increase in the risk for severe mucositis after RT (adjusted OR = 1.21; p = 0.728).- A negative but not significant association was found for Ku70c.-1310 SNP.