In women, aromatase is expressed in ovarian granulosa cells (PII), placental syncytiotrophoblast (PI.1, and 2a) brain (PI.f), breast cancer (PII, PI.3), skin fibroblasts, bone osteoblasts and chondrocytes (PI.4) and adipose stromal fibroblasts (PI.4) [7,8]. Here, CYP19A1 is linked to breast cancer.