OR4S2 and breast cancer: Nevertheless, it is noteworthy that patients with GSTT1 gene deletion (BC40, BC52) had a good survival with absence of cancer recurrence for at least 5 years, while disease relapse was observed in 3 patients (BC1-1, BC22, BC47) with a normal copy of GSTT1. In addition, two recently published reports showed that OR4C11, OR4P4, OR4S2 and UGT2B17 are associated with breast cancer with respectively 2.6, 2.4, 2.1 and 2.2-fold increase in breast cancer risk [4, 19] and it was proven also that the expression of UGT2B17 gene is correlated with the corresponding germline CNVs [19].