The polymorphisms UGT1A8*3, UGT2B7*2, and UGT2B15*2 were analyzed by Ahern et al. (2011), who found no significant associations between their variant alleles and recurrence-free survival in breast cancer patients under adjuvant or neoadjuvant treatment with tamoxifen (Table 2). Here, UGT2B15 is linked to breast cancer.