FIGURE 2.

In vitro anti-tumor activity of NGO-PEG-PEI/Cer. (A) Cells were seeded in 96-well plates and infected with NGO-PEG-PEI/CER or C6-ceramide at a series of concentrations. Cell viability was determined by MTT cell proliferation assays at 48 h post-infection. The results were presented as mean ± SD of three separate experiments. (B) Clonogenic formation of HepG2 cells treated by NGO-PEG-PEI/Cer. ^∗P < 0.05, ^∗∗P < 0.01.