NC inhibited ovarian cancer cell proliferation and induced apoptosis. (A) Ovarian cancer cell viability was detected after treatment with NC for 24 h, 48 h and 72 h, respectively, using MTT assay. *P < 0.05, **P < 0.01, ***P < 0.001 compared with the control groups treated with DMSO. (B) NC-induced ovarian cancer cell apoptosis was accessed by Flow cytometry.