MMP9 and cancer: Human cancer cell lines of cervix (SiHa) and breast (MCF-7) cultured on a surface coated with laminin-1 have been shown to express matrix metalloproteinase-9 (MMP-9) [9,10], a 92-kDa member of the MMP family, which are calcium- and zinc-dependent metalloproteinases implicated in degradation of the extracellular matrix in normal as well as pathological conditions [11].