CTLA4 and breast cancer: The polymorphisms +49 G/A (rs231775), −1661 A/G (rs4553808), −1722 T/C (rs733618), −318 C/T (rs5742909) and CT60 G/A (rs3087243) in the CD152 gene have been discussed their relationship with the susceptibility to BC in previous studies, but relevant findings were conflicting.