MDC1 and cervical cancer: GIPZ lentiviral MDC1 shRNA (Dharmacon, Inc.)and pCDNA3 MDC1(a kind gift from Prof. Michel Goldberg, Hebrew University, Jerusalem) (Additional file 1: Figure S1 and Additional file 2: Figure S2) were used to generate the stable cervical cancer cell lines using Lipofectamine (Thermo fisher scientific).