XRCC1 and nasopharyngeal carcinoma: In 60 Chinese patients with locally advanced NPC after radiotherapy, Zhai et al discovered that XRCC1 rs25487 AA was correlated with higher rate of medium-term tumor regression after RT for primary nasopharyngeal neoplasm and metastatic lymph nodes than other two genotypes (>80% vs 40-60%, P < 0.01) [26].