Average levels of steroids in breast tissue of healthy women.a.

aTen healthy breast tissue samples were analyzed at least 2 times. The data obtained from UPLC-MS/MS were processed and normalized to pmole/gm of tissue.bSince the E1 and E2 forms are inter convertible, the total amount for each E1 plus E2 derivative in the various categories are presented in the last column.cAll 4-OHE1(E2) conjugates are pooled together.dAll 2-OHE1(E2) conjugates are pooled together.nd – Not detected.