XRCC2 and neoplasm: The X-ray repair complementing defective repair in Chinese hamster cells 2 (XRCC2) gene plays an important role in the homologous recombination repair (HRR) pathway at the same time can be said a functional member for taking part in tumor progression (Griffin et al., 2000; Mohindra et al., 2002; Thacker and Zdzienicka, 2004).