In human tumors and BC cell lines, FAAH expression was strongly associated with luminal features such as HR+ status and high differentiation grade, which is in line with previous observations by Jessani and cols., who detected FAAH activity exclusively in luminal BC lines MCF7 and T-47D, but not in basal-like BC cell lines such as MDA-MB-23142. This evidence concerns the gene FAAH and breast cancer.