MMP9 and neoplasm: Matrix metalloproteinase-9 levels showed a similar enhancement for Laurén's intestinal-type carcinomas (BIA total activity 140 vs 99 U mg−1 protein, P<0.02; ELISA 29 vs 17 ng mg−1 protein, P<0.01) and differentiated tumours (BIA total activity 133±13 vs 104±16 U mg−1 protein, NS; ELISA 28±3 vs 17±3 ng mg−1 protein, P<0.02).