Until now , ER status has been assessed using a steroid binding assay ( SBA ) which has many inherent problems .
until now , er status has been assessed using a steroid binding assay ( sba ) which has many inherent problems .
O O O B-protein_family_or_group O O O O O O B-other_name I-other_name I-other_name O B-other_name O O O O O O O