The XRCC1 Arg194Trp and Arg280His polymorphisms on CC risk.

NA, not application.aNumber of comparisons.bP value of Q-test for heterogeneity test. Random-effects model was used when P value for heterogeneity test cP of Begg, P value of Begg rank correlation method for testing publication bias.dP of Egger, P value of Egger rank correlation method for testing publication bias.

NA，即不适用。a. 比较次数。b. 异质性检验（heterogeneity test）Q检验（Q-test）的P值：当异质性检验P值符合相应条件时采用随机效应模型（random-effects model）。c. Begg检验P值：用于检验发表偏倚（publication bias）的Begg秩相关法的P值。d. Egger检验P值：用于检验发表偏倚的Egger秩相关法的P值。