Treatment with USP7 inhibitor determined a significant decrease of the GFP positive cells, compared to non-treated cells, suggesting that the reduction of CCDC6 levels affected the DNA repair by HR in all the ovarian cancer cells analysed, even if the effects were most evident in OVCAR3 and OV-90 cells, with respect to Kuramochi cells (Fig. 2C). Here, USP7 is linked to ovarian cancer.