two types of hormone-dependent mammary tumors that occur in strain gr/a mice , i.e. , those that appear during pregnancy [ pregnancy-dependent mammary tumors ( prdt ) ] and those induced by treatment with progesterone ( p ) and estrogen ( e ) [ p + e-dependent mammary tumors ( p + e-dt ) ] , were compared in terms of serial transplantation , response to pregnancy , and histology .
C0033308
progesterone
C0032961
pregnancy