CYP19A1 and breast carcinoma: 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].