SKOV-3 (A) OVCAR-5 (B), and OVCAR-8 (C) ovarian cancer cell lines were cultured with Nutlin (10 µM) or vehicle control (DMSO). Whole cell protein lysates were evaluated by Western blot. Following 5 Gy of γ-radiation, neutral comet assays were used to measure DNA breaks. Each bar represents the average of 2–4 independent experiments with a minimum of 40 cells analyzed for each sample. A, *p=0.0073, **p=0.035; B, *p=0.0047, **p=0.01; C, *p=0.004, **p=0.0073, student’s t-test.