May bind androgens and other steroids, may also bind estramustine, a chemotherapeutic agent used for prostate cancer. May be under transcriptional regulation of steroid hormones. Heterodimer of a lipophilin A and a lipophilin C (mammaglobin B) monomer associated head to head. Expressed in thymus, trachea, kidney, steroid responsive tissues (prostate, testis, uterus, breast and ovary) and salivary gland. Belongs to the secretoglobin family. Lipophilin subfamily.