to examine whether plasminogen activator reflects the functional state of estrogen receptors in human breast cancer , the enzyme activities were determined in extracts prepared from 160 breast cancer specimens and compared on qualitative and quantitative bases with the levels of steroid receptors , such as cytoplasmic estrogen receptor ( erc ) , progesterone receptor ( pgr ) and nuclear estrogen receptor ( ern ) .
C0034840
steroid receptors
C0034833
progesterone receptor