Previously published results of the GWAS studies have revealed several loci related to BC development, including 1p13.3 (GSTM1), 2q37.1 (UGT1A cluster), 3q28 (TP63), 4p16.3 (TMEM129 and TACC3-FGFR3), 5p15.33 (TERT-CLPTM1L), 8p22 (NAT2), 8q24.21, 8q24.3 (PSCA), 18q12.3 (SLC14A1), 19q12 (CCNE1), 22q13.1 (CBX6, APOBEC3A) 3q26.2 (MTNN), 11p15.5 (CDKAL1) and 8q24 (MYC)50–61. Here, UGT1A1 is linked to breast cancer.