Cisplatin and OD affect cell viability of ovarian cancer cells. Cell viability was measured after treatment with (A) cisplatin (0–80μM), water (WOD) and methanol (MOD) extract of OD in (B) A2780 and (C) A2780cis, (D) combination of cisplatin (0–20 μM) and MOD (0–80 μg/mL) for 48 h on both ovarian cancer cells A2780 and A2780cis. To measure cell viability, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays were used. Data are shown as the mean ± standard deviations (STDEV). Statistically, one-way analysis of variance (ANOVA) and Duncan’s post-hoc tests were used for the comparison between treatment doses in each cell line. Different letters indicate significant difference within a group as determined by Student’s t-test for A2780 (capital letters) and A2780cis (small letters) results. * p < 0.05 was used to define statistical significance.