the presence of 17-hydroxysteroid oxidoreductase , aromatase , 5 alpha-reductase , and 3-hydroxysteroid oxidoreductase activities in mcf-7 suggests the possibility that the hormonal regulation of these human breast cancer cells may be mediated in part by intracellular estrogen and/or androgen biosynthesis .
C0000165
17-hydroxysteroid
C0020392
hydroxysteroid