Summary of the linear regression analysis of the correlations between cytotoxicity and oxidative stress responses of both cell types, HUVEC and HMVEC-C, due to liposomes and quantum dots, respectively, and their concentration. Concentration is expressed as either exposure concentration in culture medium, associated NP concentration or internalized NP concentration. Cell responses to nanoparticles were either normalized to negative and positive controls (A) or estimated as a multiple of the negative control only (B).