tokens: The current study aimed to investigate the immunohistochemical expression of matrix metalloproteinase 3 ( MMP-3 , stromelysin-1 ) in correlation with the expression of Basement Membrane ( BM ) antigen ( type IV collagen , laminin ) , fibronectin , cathepsin D , p53 , c-erbB-2 , proliferative activity ( Ki-67 , PCNA ) , steroid receptor content as well as to the other conventional clinicopathological parameters in breast cancer .