XRCC1 and leukemia: Although the association between XRCC1 polymorphisms and risk of some types of leukemia was recognized by a number of studies [15], [17], [20], [21], [22], [23], [24], [25], [27], [28], [29], [32], [33], other reports did not take the XRCC1 genetic variants as risk or protective factors for leukemia [16], [18], [19], [26], [30], [31].