In the present study, several common CNVs overlapping with CNV regions previously reported as associated with breast cancer risk were identified including CNVs affecting UGT2B15, UGT2B17, OR4C11, OR4P4, OR4S2, APOBEC3A, APOBEC3B and GSTT1 genes [4, 19]. Here, OR4S2 is linked to breast cancer.