CTCF and ovarian cancer: Western blot analysis revealed that CTCF protein expression was directly correlated with that of CTBP1 (R=0.69, P<0.01), SERPINE1 (R=0.56, P<0.05) and SRC (R=0.83, P<0.0001) (Figure 6B and 6C) in 18 fresh ovarian cancer specimens (Supplementary Table 3).