Figure 2. Multiwalled carbon nanotubes (MWCNTs) inhibits tumor growth in SKOV3 cells. (A) Cell viability of SKOV3 cells treated with different doses of MWCNTs at 24h and 48 h by MTT assay. (B) Clone number of SKOV3cells treated with different doses of MWCNTs at 24h by colony formation assay. (C) Cell cycle of SKOV3 cells treated with different doses of MWCNTs at 24h by flow cytometry analysis. (D) Cell apoptosis rate of SKOV3 cells treated with different doses of MWCNTs at 24h and 48 h by flow cytometry analysis. *P < 0.05, and **P < 0.01 vs control cells (0 μg/mL MWCNTs).