MMP9 and squamous cell carcinoma: The aim of this study was to review and analyse the effects of lutein and Poly(d,l-lactide-co-glycolide) (PLGA) Nps containing lutein (Lut Nps) on oxidative stress biomarkers (OXSR-1, FOXO-3 and TAC) and the collagen degradation biomarker, MMP-9, in human cells BICR10 (ECACC 04072103) of buccal mucosa squamous carcinoma.